Merge remote-tracking branch 'origin/dev' into wip/qt6

Change-Id: Iac12a37fa6536ebe30e6548f7c54ec0c402c9f5d

94 files changed, 1521 insertions, 621 deletions

diff --git a/src/plugins/platforms/android/qandroidinputcontext.cpp b/src/plugins/platforms/android/qandroidinputcontext.cpp
index 00ab3409d3..db40c30d7d 100644
--- a/src/plugins/platforms/android/qandroidinputcontext.cpp
+++ b/src/plugins/platforms/android/qandroidinputcontext.cpp
@@ -791,7 +791,7 @@ void QAndroidInputContext::longPress(int x, int y)
             return;
         }
         QList<QInputMethodEvent::Attribute> imAttributes;
-        imAttributes.append(QInputMethodEvent::Attribute(QInputMethodEvent::Cursor, cursor, 0, QVariant()));
+        imAttributes.append(QInputMethodEvent::Attribute(QInputMethodEvent::Cursor, 0, 0, QVariant()));
         imAttributes.append(QInputMethodEvent::Attribute(QInputMethodEvent::Selection, anchor, cursor - anchor, QVariant()));
         QInputMethodEvent event(QString(), imAttributes);
         QGuiApplication::sendEvent(m_focusObject, &event);
@@ -1129,46 +1129,63 @@ QString QAndroidInputContext::getSelectedText(jint /*flags*/)
 
 QString QAndroidInputContext::getTextAfterCursor(jint length, jint /*flags*/)
 {
-    //### the preedit text could theoretically be after the cursor
-    QVariant textAfter = QInputMethod::queryFocusObject(Qt::ImTextAfterCursor, QVariant(length));
-    if (textAfter.isValid()) {
-        return textAfter.toString().left(length);
-    }
-
-    //compatibility code for old controls that do not implement the new API
-    QSharedPointer<QInputMethodQueryEvent> query = focusObjectInputMethodQuery();
-    if (query.isNull())
+    if (length <= 0)
         return QString();
 
-    QString text = query->value(Qt::ImSurroundingText).toString();
-    if (!text.length())
-        return text;
+    QString text;
 
-    int cursorPos = query->value(Qt::ImCursorPosition).toInt();
-    return text.mid(cursorPos, length);
+    QVariant reportedTextAfter = QInputMethod::queryFocusObject(Qt::ImTextAfterCursor, length);
+    if (reportedTextAfter.isValid()) {
+        text = reportedTextAfter.toString();
+    } else {
+        // Compatibility code for old controls that do not implement the new API
+        QSharedPointer<QInputMethodQueryEvent> query =
+                focusObjectInputMethodQuery(Qt::ImCursorPosition | Qt::ImSurroundingText);
+        if (query) {
+            const int cursorPos = query->value(Qt::ImCursorPosition).toInt();
+            text = query->value(Qt::ImSurroundingText).toString().mid(cursorPos);
+        }
+    }
+
+    // Controls do not report preedit text, so we have to add it
+    if (!m_composingText.isEmpty()) {
+        const int cursorPosInsidePreedit = m_composingCursor - m_composingTextStart;
+        text = m_composingText.midRef(cursorPosInsidePreedit) + text;
+    }
+
+    text.truncate(length);
+    return text;
 }
 
 QString QAndroidInputContext::getTextBeforeCursor(jint length, jint /*flags*/)
 {
-    QVariant textBefore = QInputMethod::queryFocusObject(Qt::ImTextBeforeCursor, QVariant(length));
-    if (textBefore.isValid())
-        return textBefore.toString().rightRef(length) + m_composingText;
-
-    //compatibility code for old controls that do not implement the new API
-    QSharedPointer<QInputMethodQueryEvent> query = focusObjectInputMethodQuery();
-    if (query.isNull())
+    if (length <= 0)
         return QString();
 
-    int cursorPos = query->value(Qt::ImCursorPosition).toInt();
-    QString text = query->value(Qt::ImSurroundingText).toString();
-    if (!text.length())
-        return text;
+    QString text;
 
-    //### the preedit text does not need to be immediately before the cursor
-    if (cursorPos <= length)
-        return text.leftRef(cursorPos) + m_composingText;
-    else
-        return text.midRef(cursorPos - length, length) + m_composingText;
+    QVariant reportedTextBefore = QInputMethod::queryFocusObject(Qt::ImTextBeforeCursor, length);
+    if (reportedTextBefore.isValid()) {
+        text = reportedTextBefore.toString();
+    } else {
+        // Compatibility code for old controls that do not implement the new API
+        QSharedPointer<QInputMethodQueryEvent> query =
+                focusObjectInputMethodQuery(Qt::ImCursorPosition | Qt::ImSurroundingText);
+        if (query) {
+            const int cursorPos = query->value(Qt::ImCursorPosition).toInt();
+            text = query->value(Qt::ImSurroundingText).toString().left(cursorPos);
+        }
+    }
+
+    // Controls do not report preedit text, so we have to add it
+    if (!m_composingText.isEmpty()) {
+        const int cursorPosInsidePreedit = m_composingCursor - m_composingTextStart;
+        text += m_composingText.leftRef(cursorPosInsidePreedit);
+    }
+
+    if (text.length() > length)
+        text = text.right(length);
+    return text;
 }
 
 /*
@@ -1231,6 +1248,8 @@ jboolean QAndroidInputContext::setComposingRegion(jint start, jint end)
     if (query.isNull())
         return JNI_FALSE;
 
+    if (start == end)
+        return JNI_TRUE;
     if (start > end)
         qSwap(start, end);
 
diff --git a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
index 914aaa2b1b..7fbe729381 100644
--- a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
+++ b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.h
@@ -52,7 +52,7 @@
 
 @class QT_MANGLE_NAMESPACE(QMacAccessibilityElement);
 
-@interface QT_MANGLE_NAMESPACE(QMacAccessibilityElement) : NSObject
+@interface QT_MANGLE_NAMESPACE(QMacAccessibilityElement) : NSObject <NSAccessibilityElement>
 
 - (instancetype)initWithId:(QAccessible::Id)anId;
 + (instancetype)elementWithId:(QAccessible::Id)anId;
diff --git a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm
index f0ef70e3a3..3560c9d9b5 100644
--- a/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm
+++ b/src/plugins/platforms/cocoa/qcocoaaccessibilityelement.mm
@@ -174,6 +174,17 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
 // accessibility protocol
 //
 
+- (BOOL)isAccessibilityFocused
+{
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid()) {
+        return false;
+    }
+    // Just check if the app thinks we're focused.
+    id focusedElement = NSApp.accessibilityApplicationFocusedUIElement;
+    return [focusedElement isEqual:self];
+}
+
 // attributes
 
 + (id) lineNumberForIndex: (int)index forText:(const QString &)text
@@ -187,54 +198,58 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
     return YES;
 }
 
-- (NSArray<NSString *> *)accessibilityAttributeNames {
-    static NSArray<NSString *> *defaultAttributes = [@[
-        NSAccessibilityRoleAttribute,
-        NSAccessibilityRoleDescriptionAttribute,
-        NSAccessibilitySubroleAttribute,
-        NSAccessibilityChildrenAttribute,
-        NSAccessibilityFocusedAttribute,
-        NSAccessibilityParentAttribute,
-        NSAccessibilityWindowAttribute,
-        NSAccessibilityTopLevelUIElementAttribute,
-        NSAccessibilityPositionAttribute,
-        NSAccessibilitySizeAttribute,
-        NSAccessibilityTitleAttribute,
-        NSAccessibilityDescriptionAttribute,
-        NSAccessibilityEnabledAttribute
-    ] retain];
+- (NSString *) accessibilityRole {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return NSAccessibilityUnknownRole;
+    return QCocoaAccessible::macRole(iface);
+}
 
+- (NSString *) accessibilitySubRole {
     QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
     if (!iface || !iface->isValid())
-        return defaultAttributes;
+        return NSAccessibilityUnknownRole;
+    return QCocoaAccessible::macSubrole(iface);
+}
 
-    NSMutableArray<NSString *> *attributes = [[NSMutableArray<NSString *> alloc] initWithCapacity:defaultAttributes.count];
-    [attributes addObjectsFromArray:defaultAttributes];
+- (NSString *) accessibilityRoleDescription {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return NSAccessibilityUnknownRole;
+    return NSAccessibilityRoleDescription(self.accessibilityRole, self.accessibilitySubRole);
+}
 
-    if (QCocoaAccessible::hasValueAttribute(iface)) {
-        [attributes addObject:NSAccessibilityValueAttribute];
-    }
+- (NSArray *) accessibilityChildren {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return nil;
+    return QCocoaAccessible::unignoredChildren(iface);
+}
 
-    if (iface->textInterface()) {
-        [attributes addObjectsFromArray:@[
-            NSAccessibilityNumberOfCharactersAttribute,
-            NSAccessibilitySelectedTextAttribute,
-            NSAccessibilitySelectedTextRangeAttribute,
-            NSAccessibilityVisibleCharacterRangeAttribute,
-            NSAccessibilityInsertionPointLineNumberAttribute
-        ]];
-
-// TODO: multi-selection: NSAccessibilitySelectedTextRangesAttribute,
-    }
+- (id) accessibilityWindow {
+    // We're in the same window as our parent.
+    return [self.accessibilityParent accessibilityWindow];
+}
 
-    if (iface->valueInterface()) {
-        [attributes addObjectsFromArray:@[
-            NSAccessibilityMinValueAttribute,
-            NSAccessibilityMaxValueAttribute
-        ]];
-    }
+- (id) accessibilityTopLevelUIElementAttribute {
+    // We're in the same top level element as our parent.
+    return [self.accessibilityParent accessibilityTopLevelUIElementAttribute];
+}
 
-    return [attributes autorelease];
+- (NSString *) accessibilityTitle {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return nil;
+    if (iface->role() == QAccessible::StaticText)
+        return nil;
+    return iface->text(QAccessible::Name).toNSString();
+}
+
+- (BOOL) accessibilityEnabledAttribute {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return false;
+    return !iface->state().disabled;
 }
 
 - (id)accessibilityParent {
@@ -271,112 +286,117 @@ static void convertLineOffset(QAccessibleTextInterface *text, int *line, int *of
     return QCocoaScreen::mapToNative(iface->rect());
 }
 
-- (id) minValueAttribute:(QAccessibleInterface*)iface {
+- (NSString*)accessibilityLabel {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid()) {
+        qWarning() << "Called accessibilityLabel on invalid object: " << axid;
+        return nil;
+    }
+    return iface->text(QAccessible::Description).toNSString();
+}
+
+- (void)setAccessibilityLabel:(NSString*)label{
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return;
+    iface->setText(QAccessible::Description, QString::fromNSString(label));
+}
+
+- (id) accessibilityMinValue:(QAccessibleInterface*)iface {
     if (QAccessibleValueInterface *val = iface->valueInterface())
         return @(val->minimumValue().toDouble());
     return nil;
 }
 
-- (id) maxValueAttribute:(QAccessibleInterface*)iface {
+- (id) accessibilityMaxValue:(QAccessibleInterface*)iface {
     if (QAccessibleValueInterface *val = iface->valueInterface())
         return @(val->maximumValue().toDouble());
     return nil;
 }
 
-- (id)accessibilityAttributeValue:(NSString *)attribute {
+- (id) accessibilityValue {
     QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
-    if (!iface || !iface->isValid()) {
-        qWarning() << "Called attribute on invalid object: " << axid;
+    if (!iface || !iface->isValid())
         return nil;
-    }
 
-    if ([attribute isEqualToString:NSAccessibilityRoleAttribute]) {
-        return QCocoaAccessible::macRole(iface);
-    } else if ([attribute isEqualToString:NSAccessibilitySubroleAttribute]) {
-        return QCocoaAccessible::macSubrole(iface);
-    } else if ([attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute]) {
-        return NSAccessibilityRoleDescription(QCocoaAccessible::macRole(iface),
-            [self accessibilityAttributeValue:NSAccessibilitySubroleAttribute]);
-    } else if ([attribute isEqualToString:NSAccessibilityChildrenAttribute]) {
-        return QCocoaAccessible::unignoredChildren(iface);
-    } else if ([attribute isEqualToString:NSAccessibilityFocusedAttribute]) {
-        // Just check if the app thinks we're focused.
-        id focusedElement = [NSApp accessibilityAttributeValue:NSAccessibilityFocusedUIElementAttribute];
-        return @([focusedElement isEqual:self]);
-    } else if ([attribute isEqualToString:NSAccessibilityParentAttribute]) {
-        return self.accessibilityParent;
-    } else if ([attribute isEqualToString:NSAccessibilityWindowAttribute]) {
-        // We're in the same window as our parent.
-        return [[self accessibilityParent] accessibilityAttributeValue:NSAccessibilityWindowAttribute];
-    } else if ([attribute isEqualToString:NSAccessibilityTopLevelUIElementAttribute]) {
-        // We're in the same top level element as our parent.
-        return [[self accessibilityParent] accessibilityAttributeValue:NSAccessibilityTopLevelUIElementAttribute];
-    } else if ([attribute isEqualToString:NSAccessibilityPositionAttribute]) {
-        // The position in points of the element's lower-left corner in screen-relative coordinates
-        QPointF qtPosition = QRectF(iface->rect()).bottomLeft();
-        return [NSValue valueWithPoint:QCocoaScreen::mapToNative(qtPosition)];
-    } else if ([attribute isEqualToString:NSAccessibilitySizeAttribute]) {
-        QSize qtSize = iface->rect().size();
-        return [NSValue valueWithSize: NSMakeSize(qtSize.width(), qtSize.height())];
-    } else if ([attribute isEqualToString:NSAccessibilityTitleAttribute]) {
-        if (iface->role() == QAccessible::StaticText)
-            return nil;
-        return iface->text(QAccessible::Name).toNSString();
-    } else if ([attribute isEqualToString:NSAccessibilityDescriptionAttribute]) {
-        return iface->text(QAccessible::Description).toNSString();
-    } else if ([attribute isEqualToString:NSAccessibilityEnabledAttribute]) {
-        return @(!iface->state().disabled);
-    } else if ([attribute isEqualToString:NSAccessibilityValueAttribute]) {
-        // VoiceOver asks for the value attribute for all elements. Return nil
-        // if we don't want the element to have a value attribute.
-        if (!QCocoaAccessible::hasValueAttribute(iface))
-            return nil;
+    // VoiceOver asks for the value attribute for all elements. Return nil
+    // if we don't want the element to have a value attribute.
+    if (!QCocoaAccessible::hasValueAttribute(iface))
+        return nil;
+
+    return QCocoaAccessible::getValueAttribute(iface);
+}
 
-        return QCocoaAccessible::getValueAttribute(iface);
+- (NSInteger) accessibilityNumberOfCharacters {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return 0;
+    if (QAccessibleTextInterface *text = iface->textInterface())
+        return text->characterCount();
+    return 0;
+}
 
-    } else if ([attribute isEqualToString:NSAccessibilityNumberOfCharactersAttribute]) {
-        if (QAccessibleTextInterface *text = iface->textInterface())
-            return @(text->characterCount());
+- (NSString *) accessibilitySelectedText {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
         return nil;
-    } else if ([attribute isEqualToString:NSAccessibilitySelectedTextAttribute]) {
-        if (QAccessibleTextInterface *text = iface->textInterface()) {
-            int start = 0;
-            int end = 0;
+    if (QAccessibleTextInterface *text = iface->textInterface()) {
+        int start = 0;
+        int end = 0;
+        text->selection(0, &start, &end);
+        return text->text(start, end).toNSString();
+    }
+    return nil;
+}
+
+- (NSRange) accessibilitySelectedTextRange {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return NSRange();
+    if (QAccessibleTextInterface *text = iface->textInterface()) {
+        int start = 0;
+        int end = 0;
+        if (text->selectionCount() > 0) {
             text->selection(0, &start, &end);
-            return text->text(start, end).toNSString();
-        }
-        return nil;
-    } else if ([attribute isEqualToString:NSAccessibilitySelectedTextRangeAttribute]) {
-        if (QAccessibleTextInterface *text = iface->textInterface()) {
-            int start = 0;
-            int end = 0;
-            if (text->selectionCount() > 0) {
-                text->selection(0, &start, &end);
-            } else {
-                start = text->cursorPosition();
-                end = start;
-            }
-            return [NSValue valueWithRange:NSMakeRange(quint32(start), quint32(end - start))];
-        }
-        return [NSValue valueWithRange: NSMakeRange(0, 0)];
-    } else if ([attribute isEqualToString:NSAccessibilityVisibleCharacterRangeAttribute]) {
-        // FIXME This is not correct and may impact performance for big texts
-        if (QAccessibleTextInterface *text = iface->textInterface())
-            return [NSValue valueWithRange: NSMakeRange(0, text->characterCount())];
-        return [NSValue valueWithRange: NSMakeRange(0, iface->text(QAccessible::Name).length())];
-    } else if ([attribute isEqualToString:NSAccessibilityInsertionPointLineNumberAttribute]) {
-        if (QAccessibleTextInterface *text = iface->textInterface()) {
-            int position = text->cursorPosition();
-            return [self accessibilityAttributeValue:NSAccessibilityLineForIndexParameterizedAttribute forParameter:@(position)];
+        } else {
+            start = text->cursorPosition();
+            end = start;
         }
-        return nil;
-    } else if ([attribute isEqualToString:NSAccessibilityMinValueAttribute]) {
-        return [self minValueAttribute:iface];
-    } else if ([attribute isEqualToString:NSAccessibilityMaxValueAttribute]) {
-        return [self maxValueAttribute:iface];
+        return NSMakeRange(quint32(start), quint32(end - start));
     }
+    return NSMakeRange(0, 0);
+}
 
-    return nil;
+- (NSInteger)accessibilityLineForIndex:(NSInteger)index {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return 0;
+    if (QAccessibleTextInterface *text = iface->textInterface()) {
+        QString textToPos = text->text(0, index);
+        return textToPos.count('\n');
+    }
+    return 0;
+}
+
+- (NSRange)accessibilityVisibleCharacterRange {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return NSRange();
+    // FIXME This is not correct and may impact performance for big texts
+    if (QAccessibleTextInterface *text = iface->textInterface())
+        return NSMakeRange(0, static_cast<uint>(text->characterCount()));
+    return NSMakeRange(0, static_cast<uint>(iface->text(QAccessible::Name).length()));
+}
+
+- (NSInteger) accessibilityInsertionPointLineNumber {
+    QAccessibleInterface *iface = QAccessible::accessibleInterface(axid);
+    if (!iface || !iface->isValid())
+        return 0;
+    if (QAccessibleTextInterface *text = iface->textInterface()) {
+        int position = text->cursorPosition();
+        return [self accessibilityLineForIndex:position];
+    }
+    return 0;
 }
 
 - (NSArray *)accessibilityParameterizedAttributeNames {
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.h b/src/plugins/platforms/cocoa/qcocoabackingstore.h
index 6f24598250..acddc3ecc8 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.h
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.h
@@ -76,9 +76,12 @@ public:
     void endPaint() override;
 
     void flush(QWindow *, const QRegion &, const QPoint &) override;
+#ifndef QT_NO_OPENGL
     void composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset,
         QPlatformTextureList *textures, bool translucentBackground) override;
+#endif
 
+    QImage toImage() const override;
     QPlatformGraphicsBuffer *graphicsBuffer() const override;
 
 private:
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index d42a723b47..c381f87844 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -273,18 +273,6 @@ void QNSWindowBackingStore::redrawRoundedBottomCorners(CGRect windowRect) const
 
 // ----------------------------------------------------------------------------
 
-// https://stackoverflow.com/a/52722575/2761869
-template<class R>
-struct backwards_t {
-  R r;
-  constexpr auto begin() const { using std::rbegin; return rbegin(r); }
-  constexpr auto begin() { using std::rbegin; return rbegin(r); }
-  constexpr auto end() const { using std::rend; return rend(r); }
-  constexpr auto end() { using std::rend; return rend(r); }
-};
-template<class R>
-constexpr backwards_t<R> backwards(R&& r) { return {std::forward<R>(r)}; }
-
 QCALayerBackingStore::QCALayerBackingStore(QWindow *window)
     : QPlatformBackingStore(window)
 {
@@ -523,6 +511,7 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
     // the window server.
 }
 
+#ifndef QT_NO_OPENGL
 void QCALayerBackingStore::composeAndFlush(QWindow *window, const QRegion &region, const QPoint &offset,
                                     QPlatformTextureList *textures, bool translucentBackground)
 {
@@ -531,6 +520,22 @@ void QCALayerBackingStore::composeAndFlush(QWindow *window, const QRegion &regio
 
     QPlatformBackingStore::composeAndFlush(window, region, offset, textures, translucentBackground);
 }
+#endif
+
+QImage QCALayerBackingStore::toImage() const
+{
+    if (!const_cast<QCALayerBackingStore*>(this)->prepareForFlush())
+        return QImage();
+
+    // We need to make a copy here, as the returned image could be used just
+    // for reading, in which case it won't detach, and then the underlying
+    // image data might change under the feet of the client when we re-use
+    // the buffer at a later point.
+    m_buffers.back()->lock(QPlatformGraphicsBuffer::SWReadAccess);
+    QImage imageCopy = m_buffers.back()->asImage()->copy();
+    m_buffers.back()->unlock();
+    return imageCopy;
+}
 
 QPlatformGraphicsBuffer *QCALayerBackingStore::graphicsBuffer() const
 {
diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.h b/src/plugins/platforms/cocoa/qcocoahelpers.h
index 69aa7937b6..69a1854598 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.h
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.h
@@ -176,6 +176,18 @@ T qt_mac_resolveOption(const T &fallback, QWindow *window, const QByteArray &pro
     return fallback;
 }
 
+// https://stackoverflow.com/a/52722575/2761869
+template<class R>
+struct backwards_t {
+  R r;
+  constexpr auto begin() const { using std::rbegin; return rbegin(r); }
+  constexpr auto begin() { using std::rbegin; return rbegin(r); }
+  constexpr auto end() const { using std::rend; return rend(r); }
+  constexpr auto end() { using std::rend; return rend(r); }
+};
+template<class R>
+constexpr backwards_t<R> backwards(R&& r) { return {std::forward<R>(r)}; }
+
 // -------------------------------------------------------------------------
 
 #if !defined(Q_PROCESSOR_X86_64)
diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.mm b/src/plugins/platforms/cocoa/qcocoahelpers.mm
index 9c705616ba..1b184cd60f 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.mm
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.mm
@@ -63,7 +63,7 @@ QT_BEGIN_NAMESPACE
 Q_LOGGING_CATEGORY(lcQpaWindow, "qt.qpa.window");
 Q_LOGGING_CATEGORY(lcQpaDrawing, "qt.qpa.drawing");
 Q_LOGGING_CATEGORY(lcQpaMouse, "qt.qpa.input.mouse", QtCriticalMsg);
-Q_LOGGING_CATEGORY(lcQpaScreen, "qt.qpa.screen");
+Q_LOGGING_CATEGORY(lcQpaScreen, "qt.qpa.screen", QtCriticalMsg);
 
 //
 // Conversion Functions
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.h b/src/plugins/platforms/cocoa/qcocoaintegration.h
index 04cb4e1226..bfc3bfe9de 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.h
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.h
@@ -61,8 +61,6 @@
 
 QT_BEGIN_NAMESPACE
 
-class QCocoaScreen;
-
 class QCocoaIntegration : public QObject, public QPlatformIntegration
 {
     Q_OBJECT
@@ -113,9 +111,6 @@ public:
     Qt::KeyboardModifiers queryKeyboardModifiers() const override;
     QList<int> possibleKeys(const QKeyEvent *event) const override;
 
-    void updateScreens();
-    QCocoaScreen *screenForNSScreen(NSScreen *nsScreen);
-
     void setToolbar(QWindow *window, NSToolbar *toolbar);
     NSToolbar *toolbar(QWindow *window) const;
     void clearToolbars();
@@ -143,8 +138,6 @@ private:
     QScopedPointer<QCocoaAccessibility> mAccessibility;
 #endif
     QScopedPointer<QPlatformTheme> mPlatformTheme;
-    QList<QCocoaScreen *> mScreens;
-    QMacScopedObserver m_screensObserver;
 #ifndef QT_NO_CLIPBOARD
     QCocoaClipboard  *mCocoaClipboard;
 #endif
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.mm b/src/plugins/platforms/cocoa/qcocoaintegration.mm
index eb18e573ea..300082d694 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.mm
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.mm
@@ -207,9 +207,7 @@ QCocoaIntegration::QCocoaIntegration(const QStringList &paramList)
     // which will resolve to an actual value and result in screen invalidation.
     cocoaApplication.presentationOptions = NSApplicationPresentationDefault;
 
-    m_screensObserver = QMacScopedObserver([NSApplication sharedApplication],
-        NSApplicationDidChangeScreenParametersNotification, [&]() { updateScreens(); });
-    updateScreens();
+    QCocoaScreen::initializeScreens();
 
     QMacInternalPasteboardMime::initializeMimeTypes();
     QCocoaMimeTypes::initializeMimeTypes();
@@ -242,10 +240,7 @@ QCocoaIntegration::~QCocoaIntegration()
     QMacInternalPasteboardMime::destroyMimeTypes();
 #endif
 
-    // Delete screens in reverse order to avoid crash in case of multiple screens
-    while (!mScreens.isEmpty()) {
-        QWindowSystemInterface::handleScreenRemoved(mScreens.takeLast());
-    }
+    QCocoaScreen::cleanupScreens();
 
     clearToolbars();
 }
@@ -260,88 +255,6 @@ QCocoaIntegration::Options QCocoaIntegration::options() const
     return mOptions;
 }
 
-/*!
-    \brief Synchronizes the screen list, adds new screens, removes deleted ones
-*/
-void QCocoaIntegration::updateScreens()
-{
-    NSArray<NSScreen *> *scrs = [NSScreen screens];
-    NSMutableArray<NSScreen *> *screens = [NSMutableArray<NSScreen *> arrayWithArray:scrs];
-    if ([screens count] == 0)
-        if ([NSScreen mainScreen])
-           [screens addObject:[NSScreen mainScreen]];
-    if ([screens count] == 0)
-        return;
-    QSet<QCocoaScreen*> remainingScreens = QSet<QCocoaScreen*>(mScreens.constBegin(), mScreens.constEnd());
-    QList<QPlatformScreen *> siblings;
-    uint screenCount = [screens count];
-    for (uint i = 0; i < screenCount; i++) {
-        NSScreen* scr = [screens objectAtIndex:i];
-        CGDirectDisplayID dpy = scr.qt_displayId;
-        // If this screen is a mirror and is not the primary one of the mirror set, ignore it.
-        // Exception: The NSScreen API has been observed to a return a screen list with one
-        // mirrored, non-primary screen when Qt is running as a startup item. Always use the
-        // screen if there's only one screen in the list.
-        if (screenCount > 1 && CGDisplayIsInMirrorSet(dpy)) {
-            CGDirectDisplayID primary = CGDisplayMirrorsDisplay(dpy);
-            if (primary != kCGNullDirectDisplay && primary != dpy)
-                continue;
-        }
-        QCocoaScreen* screen = nullptr;
-        foreach (QCocoaScreen* existingScr, mScreens) {
-            // NSScreen documentation says do not cache the array returned from [NSScreen screens].
-            // However in practice, we can identify a screen by its pointer: if resolution changes,
-            // the NSScreen object will be the same instance, just with different values.
-            if (existingScr->nativeScreen() == scr) {
-                screen = existingScr;
-                break;
-            }
-        }
-        if (screen) {
-            remainingScreens.remove(screen);
-            screen->updateProperties();
-        } else {
-            screen = new QCocoaScreen(i);
-            mScreens.append(screen);
-            qCDebug(lcQpaScreen) << "Adding" << screen;
-            QWindowSystemInterface::handleScreenAdded(screen);
-        }
-        siblings << screen;
-    }
-
-    // Set virtual siblings list. All screens in mScreens are siblings, because we ignored the
-    // mirrors. Note that some of the screens we update the siblings list for here may be deleted
-    // below, but update anyway to keep the to-be-deleted screens out of the siblings list.
-    foreach (QCocoaScreen* screen, mScreens)
-        screen->setVirtualSiblings(siblings);
-
-    // Now the leftovers in remainingScreens are no longer current, so we can delete them.
-    foreach (QCocoaScreen* screen, remainingScreens) {
-        mScreens.removeOne(screen);
-        // Prevent stale references to NSScreen during destroy
-        screen->m_screenIndex = -1;
-        qCDebug(lcQpaScreen) << "Removing" << screen;
-        QWindowSystemInterface::handleScreenRemoved(screen);
-    }
-}
-
-QCocoaScreen *QCocoaIntegration::screenForNSScreen(NSScreen *nsScreen)
-{
-    NSUInteger index = [[NSScreen screens] indexOfObject:nsScreen];
-    if (index == NSNotFound)
-        return nullptr;
-
-    if (index >= unsigned(mScreens.count()))
-        updateScreens();
-
-    for (QCocoaScreen *screen : mScreens) {
-        if (screen->nativeScreen() == nsScreen)
-            return screen;
-    }
-
-    return nullptr;
-}
-
 bool QCocoaIntegration::hasCapability(QPlatformIntegration::Capability cap) const
 {
     switch (cap) {
@@ -490,8 +403,13 @@ QCocoaServices *QCocoaIntegration::services() const
 
 QVariant QCocoaIntegration::styleHint(StyleHint hint) const
 {
-    if (hint == QPlatformIntegration::FontSmoothingGamma)
+    switch (hint) {
+    case FontSmoothingGamma:
         return QCoreTextFontEngine::fontSmoothingGamma();
+    case ShowShortcutsInContextMenus:
+        return QVariant(false);
+    default: break;
+    }
 
     return QPlatformIntegration::styleHint(hint);
 }
diff --git a/src/plugins/platforms/cocoa/qcocoascreen.h b/src/plugins/platforms/cocoa/qcocoascreen.h
index 9ded98df32..491af2fe9c 100644
--- a/src/plugins/platforms/cocoa/qcocoascreen.h
+++ b/src/plugins/platforms/cocoa/qcocoascreen.h
@@ -48,10 +48,14 @@
 
 QT_BEGIN_NAMESPACE
 
+class QCocoaIntegration;
+
 class QCocoaScreen : public QPlatformScreen
 {
 public:
-    QCocoaScreen(int screenIndex);
+    static void initializeScreens();
+    static void cleanupScreens();
+
     ~QCocoaScreen();
 
     // ----------------------------------------------------
@@ -61,19 +65,18 @@ public:
     QRect availableGeometry() const override { return m_availableGeometry; }
     int depth() const override { return m_depth; }
     QImage::Format format() const override { return m_format; }
-    qreal devicePixelRatio() const override;
+    qreal devicePixelRatio() const override { return m_devicePixelRatio; }
     QSizeF physicalSize() const override { return m_physicalSize; }
     QDpi logicalDpi() const override { return m_logicalDpi; }
     qreal refreshRate() const override { return m_refreshRate; }
     QString name() const override { return m_name; }
     QPlatformCursor *cursor() const override { return m_cursor; }
     QWindow *topLevelAt(const QPoint &point) const override;
-    QList<QPlatformScreen *> virtualSiblings() const override { return m_siblings; }
+    QList<QPlatformScreen *> virtualSiblings() const override;
     QPlatformScreen::SubpixelAntialiasingType subpixelAntialiasingTypeHint() const override;
 
     // ----------------------------------------------------
-    // Additional methods
-    void setVirtualSiblings(const QList<QPlatformScreen *> &siblings) { m_siblings = siblings; }
+
     NSScreen *nativeScreen() const;
     void updateProperties();
 
@@ -82,14 +85,21 @@ public:
     bool isRunningDisplayLink() const;
 
     static QCocoaScreen *primaryScreen();
+    static QCocoaScreen *get(NSScreen *nsScreen);
+    static QCocoaScreen *get(CGDirectDisplayID displayId);
 
     static CGPoint mapToNative(const QPointF &pos, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
     static CGRect mapToNative(const QRectF &rect, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
     static QPointF mapFromNative(CGPoint pos, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
     static QRectF mapFromNative(CGRect rect, QCocoaScreen *screen = QCocoaScreen::primaryScreen());
 
-public:
-    int m_screenIndex;
+private:
+    QCocoaScreen(CGDirectDisplayID displayId);
+    static void add(CGDirectDisplayID displayId);
+    void remove();
+
+    CGDirectDisplayID m_displayId = 0;
+
     QRect m_geometry;
     QRect m_availableGeometry;
     QDpi m_logicalDpi;
@@ -99,11 +109,13 @@ public:
     QImage::Format m_format;
     QSizeF m_physicalSize;
     QCocoaCursor *m_cursor;
-    QList<QPlatformScreen *> m_siblings;
+    qreal m_devicePixelRatio;
 
     CVDisplayLinkRef m_displayLink = nullptr;
     dispatch_source_t m_displayLinkSource = nullptr;
     QAtomicInt m_pendingUpdates;
+
+    friend QDebug operator<<(QDebug debug, const QCocoaScreen *screen);
 };
 
 #ifndef QT_NO_DEBUG_STREAM
@@ -116,5 +128,4 @@ QT_END_NAMESPACE
 @property(readonly) CGDirectDisplayID qt_displayId;
 @end
 
-#endif
-
+#endif // QCOCOASCREEN_H
diff --git a/src/plugins/platforms/cocoa/qcocoascreen.mm b/src/plugins/platforms/cocoa/qcocoascreen.mm
index 6a5b0e6e3e..392099d083 100644
--- a/src/plugins/platforms/cocoa/qcocoascreen.mm
+++ b/src/plugins/platforms/cocoa/qcocoascreen.mm
@@ -41,6 +41,7 @@
 
 #include "qcocoawindow.h"
 #include "qcocoahelpers.h"
+#include "qcocoaintegration.h"
 
 #include <QtCore/qcoreapplication.h>
 #include <QtGui/private/qcoregraphics_p.h>
@@ -53,34 +54,104 @@
 
 QT_BEGIN_NAMESPACE
 
-class QCoreTextFontEngine;
-class QFontEngineFT;
+void QCocoaScreen::initializeScreens()
+{
+    uint32_t displayCount = 0;
+    if (CGGetActiveDisplayList(0, nullptr, &displayCount) != kCGErrorSuccess)
+        qFatal("Failed to get number of active displays");
+
+    CGDirectDisplayID activeDisplays[displayCount];
+    if (CGGetActiveDisplayList(displayCount, &activeDisplays[0], &displayCount) != kCGErrorSuccess)
+        qFatal("Failed to get active displays");
+
+    for (CGDirectDisplayID displayId : activeDisplays)
+        QCocoaScreen::add(displayId);
+
+    CGDisplayRegisterReconfigurationCallback([](CGDirectDisplayID displayId, CGDisplayChangeSummaryFlags flags, void *userInfo) {
+        if (flags & kCGDisplayBeginConfigurationFlag)
+            return; // Wait for changes to apply
+
+        Q_UNUSED(userInfo);
+
+        QCocoaScreen *cocoaScreen = QCocoaScreen::get(displayId);
+
+        if ((flags & kCGDisplayAddFlag) || !cocoaScreen) {
+            if (!CGDisplayIsActive(displayId)) {
+                qCDebug(lcQpaScreen) << "Not adding inactive display" << displayId;
+                return; // Will be added when activated
+            }
+            QCocoaScreen::add(displayId);
+        } else if ((flags & kCGDisplayRemoveFlag) || !CGDisplayIsActive(displayId)) {
+            cocoaScreen->remove();
+        } else {
+            // Detect changes to the primary screen immediately, instead of
+            // waiting for a display reconfigure with kCGDisplaySetMainFlag.
+            // This ensures that any property updates to the other screens
+            // will be in reference to the correct primary screen.
+            QCocoaScreen *mainDisplay = QCocoaScreen::get(CGMainDisplayID());
+            if (QGuiApplication::primaryScreen()->handle() != mainDisplay) {
+                mainDisplay->updateProperties();
+                qCInfo(lcQpaScreen) << "Primary screen changed to" << mainDisplay;
+                QWindowSystemInterface::handlePrimaryScreenChanged(mainDisplay);
+            }
 
-QCocoaScreen::QCocoaScreen(int screenIndex)
-    : QPlatformScreen(), m_screenIndex(screenIndex), m_refreshRate(60.0)
+            if (cocoaScreen == mainDisplay)
+                return; // Already reconfigured
+
+            cocoaScreen->updateProperties();
+            qCInfo(lcQpaScreen) << "Reconfigured" << cocoaScreen;
+        }
+    }, nullptr);
+}
+
+void QCocoaScreen::add(CGDirectDisplayID displayId)
+{
+    QCocoaScreen *cocoaScreen = new QCocoaScreen(displayId);
+    qCInfo(lcQpaScreen) << "Adding" << cocoaScreen;
+    QWindowSystemInterface::handleScreenAdded(cocoaScreen, CGDisplayIsMain(displayId));
+}
+
+QCocoaScreen::QCocoaScreen(CGDirectDisplayID displayId)
+    : QPlatformScreen(), m_displayId(displayId)
 {
     updateProperties();
     m_cursor = new QCocoaCursor;
 }
 
-QCocoaScreen::~QCocoaScreen()
+void QCocoaScreen::cleanupScreens()
 {
-    delete m_cursor;
+    // Remove screens in reverse order to avoid crash in case of multiple screens
+    for (QScreen *screen : backwards(QGuiApplication::screens()))
+        static_cast<QCocoaScreen*>(screen->handle())->remove();
+}
 
-    CVDisplayLinkRelease(m_displayLink);
-    if (m_displayLinkSource)
-         dispatch_release(m_displayLinkSource);
+void QCocoaScreen::remove()
+{
+    m_displayId = 0; // Prevent stale references during removal
+
+    // This may result in the application responding to QGuiApplication::screenRemoved
+    // by moving the window to another screen, either by setGeometry, or by setScreen.
+    // If the window isn't moved by the application, Qt will as a fallback move it to
+    // the primary screen via setScreen. Due to the way setScreen works, this won't
+    // actually recreate the window on the new screen, it will just assign the new
+    // QScreen to the window. The associated NSWindow will have an NSScreen determined
+    // by AppKit. AppKit will then move the window to another screen by changing the
+    // geometry, and we will get a callback in QCocoaWindow::windowDidMove and then
+    // QCocoaWindow::windowDidChangeScreen. At that point the window will appear to have
+    // already changed its screen, but that's only true if comparing the Qt screens,
+    // not when comparing the NSScreens.
+    QWindowSystemInterface::handleScreenRemoved(this);
 }
 
-NSScreen *QCocoaScreen::nativeScreen() const
+QCocoaScreen::~QCocoaScreen()
 {
-    NSArray<NSScreen *> *screens = [NSScreen screens];
+    Q_ASSERT_X(!screen(), "QCocoaScreen", "QScreen should be deleted first");
 
-    // Stale reference, screen configuration has changed
-    if (m_screenIndex < 0 || (NSUInteger)m_screenIndex >= [screens count])
-        return nil;
+    delete m_cursor;
 
-    return [screens objectAtIndex:m_screenIndex];
+    CVDisplayLinkRelease(m_displayLink);
+    if (m_displayLinkSource)
+         dispatch_release(m_displayLinkSource);
 }
 
 static QString displayName(CGDirectDisplayID displayID)
@@ -117,35 +188,37 @@ static QString displayName(CGDirectDisplayID displayID)
 
 void QCocoaScreen::updateProperties()
 {
-    NSScreen *nsScreen = nativeScreen();
-    if (!nsScreen)
-        return;
+    Q_ASSERT(m_displayId);
 
     const QRect previousGeometry = m_geometry;
     const QRect previousAvailableGeometry = m_availableGeometry;
     const QDpi previousLogicalDpi = m_logicalDpi;
     const qreal previousRefreshRate = m_refreshRate;
 
+    // Some properties are only available via NSScreen
+    NSScreen *nsScreen = nativeScreen();
+    Q_ASSERT(nsScreen);
+
     // The reference screen for the geometry is always the primary screen
-    QRectF primaryScreenGeometry = QRectF::fromCGRect([[NSScreen screens] firstObject].frame);
+    QRectF primaryScreenGeometry = QRectF::fromCGRect(CGDisplayBounds(CGMainDisplayID()));
     m_geometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.frame), primaryScreenGeometry).toRect();
     m_availableGeometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.visibleFrame), primaryScreenGeometry).toRect();
 
+    m_devicePixelRatio = nsScreen.backingScaleFactor;
+
     m_format = QImage::Format_RGB32;
-    m_depth = NSBitsPerPixelFromDepth([nsScreen depth]);
+    m_depth = NSBitsPerPixelFromDepth(nsScreen.depth);
 
-    CGDirectDisplayID dpy = nsScreen.qt_displayId;
-    CGSize size = CGDisplayScreenSize(dpy);
+    CGSize size = CGDisplayScreenSize(m_displayId);
     m_physicalSize = QSizeF(size.width, size.height);
     m_logicalDpi.first = 72;
     m_logicalDpi.second = 72;
-    CGDisplayModeRef displayMode = CGDisplayCopyDisplayMode(dpy);
+
+    QCFType<CGDisplayModeRef> displayMode = CGDisplayCopyDisplayMode(m_displayId);
     float refresh = CGDisplayModeGetRefreshRate(displayMode);
-    CGDisplayModeRelease(displayMode);
-    if (refresh > 0)
-        m_refreshRate = refresh;
+    m_refreshRate = refresh > 0 ? refresh : 60.0;
 
-    m_name = displayName(dpy);
+    m_name = displayName(m_displayId);
 
     const bool didChangeGeometry = m_geometry != previousGeometry || m_availableGeometry != previousAvailableGeometry;
 
@@ -155,24 +228,6 @@ void QCocoaScreen::updateProperties()
         QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(screen(), m_logicalDpi.first, m_logicalDpi.second);
     if (m_refreshRate != previousRefreshRate)
         QWindowSystemInterface::handleScreenRefreshRateChange(screen(), m_refreshRate);
-
-    qCDebug(lcQpaScreen) << "Updated properties for" << this;
-
-    if (didChangeGeometry) {
-        // When a screen changes its geometry, AppKit will send us a NSWindowDidMoveNotification
-        // for each window, resulting in calls to handleGeometryChange(), but this happens before
-        // the NSApplicationDidChangeScreenParametersNotification, so when we map the new geometry
-        // (which is correct at that point) to the screen using QCocoaScreen::mapFromNative(), we
-        // end up using the stale screen geometry, and the new window geometry we report is wrong.
-        // To make sure we finally report the correct window geometry, we need to do another pass
-        // of geometry reporting, now that the screen properties have been updates. FIXME: Ideally
-        // this would be solved by not caching the screen properties in QCocoaScreen, but that
-        // requires more research.
-        for (QWindow *window : windows()) {
-            if (QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow*>(window->handle()))
-                cocoaWindow->handleGeometryChange();
-        }
-    }
 }
 
 // ----------------------- Display link -----------------------
@@ -181,8 +236,10 @@ Q_LOGGING_CATEGORY(lcQpaScreenUpdates, "qt.qpa.screen.updates", QtCriticalMsg);
 
 void QCocoaScreen::requestUpdate()
 {
+    Q_ASSERT(m_displayId);
+
     if (!m_displayLink) {
-        CVDisplayLinkCreateWithCGDisplay(nativeScreen().qt_displayId, &m_displayLink);
+        CVDisplayLinkCreateWithCGDisplay(m_displayId, &m_displayLink);
         CVDisplayLinkSetOutputCallback(m_displayLink, [](CVDisplayLinkRef, const CVTimeStamp*,
             const CVTimeStamp*, CVOptionFlags, CVOptionFlags*, void* displayLinkContext) -> int {
                 // FIXME: It would be nice if update requests would include timing info
@@ -269,6 +326,9 @@ struct DeferredDebugHelper
 
 void QCocoaScreen::deliverUpdateRequests()
 {
+    if (!m_displayId)
+        return; // Screen removed
+
     QMacAutoReleasePool pool;
 
     // The CVDisplayLink callback is a notification that it's a good time to produce a new frame.
@@ -283,7 +343,7 @@ void QCocoaScreen::deliverUpdateRequests()
         const int pendingUpdates = ++m_pendingUpdates;
 
         DeferredDebugHelper screenUpdates(lcQpaScreenUpdates());
-        qDeferredDebug(screenUpdates) << "display link callback for screen " << m_screenIndex;
+        qDeferredDebug(screenUpdates) << "display link callback for screen " << m_displayId;
 
         if (const int framesAheadOfDelivery = pendingUpdates - 1) {
             // If we have more than one update pending it means that a previous display link callback
@@ -370,13 +430,6 @@ bool QCocoaScreen::isRunningDisplayLink() const
 
 // -----------------------------------------------------------
 
-qreal QCocoaScreen::devicePixelRatio() const
-{
-    QMacAutoReleasePool pool;
-    NSScreen *nsScreen = nativeScreen();
-    return qreal(nsScreen ? [nsScreen backingScaleFactor] : 1.0);
-}
-
 QPlatformScreen::SubpixelAntialiasingType QCocoaScreen::subpixelAntialiasingTypeHint() const
 {
     QPlatformScreen::SubpixelAntialiasingType type = QPlatformScreen::subpixelAntialiasingTypeHint();
@@ -430,7 +483,7 @@ QPixmap QCocoaScreen::grabWindow(WId view, int x, int y, int width, int height)
 {
     // Determine the grab rect. FIXME: The rect should be bounded by the view's
     // geometry, but note that for the pixeltool use case that window will be the
-    // desktop widgets's view, which currently gets resized to fit one screen
+    // desktop widget's view, which currently gets resized to fit one screen
     // only, since its NSWindow has the NSWindowStyleMaskTitled flag set.
     Q_UNUSED(view);
     QRect grabRect = QRect(x, y, width, height);
@@ -482,7 +535,7 @@ QPixmap QCocoaScreen::grabWindow(WId view, int x, int y, int width, int height)
     for (uint i = 0; i < displayCount; ++i)
         dpr = qMax(dpr, images.at(i).devicePixelRatio());
 
-    // Alocate target pixmap and draw each screen's content
+    // Allocate target pixmap and draw each screen's content
     qCDebug(lcQpaScreen) << "Create grap pixmap" << grabRect.size() << "at devicePixelRatio" << dpr;
     QPixmap windowPixmap(grabRect.size() * dpr);
     windowPixmap.setDevicePixelRatio(dpr);
@@ -499,7 +552,57 @@ QPixmap QCocoaScreen::grabWindow(WId view, int x, int y, int width, int height)
 */
 QCocoaScreen *QCocoaScreen::primaryScreen()
 {
-    return static_cast<QCocoaScreen *>(QGuiApplication::primaryScreen()->handle());
+    auto screen = static_cast<QCocoaScreen *>(QGuiApplication::primaryScreen()->handle());
+    Q_ASSERT_X(screen == get(CGMainDisplayID()), "QCocoaScreen",
+        "The application's primary screen should always be in sync with the main display");
+    return screen;
+}
+
+QList<QPlatformScreen*> QCocoaScreen::virtualSiblings() const
+{
+    QList<QPlatformScreen*> siblings;
+
+    // Screens on macOS are always part of the same virtual desktop
+    for (QScreen *screen : QGuiApplication::screens())
+        siblings << screen->handle();
+
+    return siblings;
+}
+
+QCocoaScreen *QCocoaScreen::get(NSScreen *nsScreen)
+{
+    return get(nsScreen.qt_displayId);
+}
+
+QCocoaScreen *QCocoaScreen::get(CGDirectDisplayID displayId)
+{
+    for (QScreen *screen : QGuiApplication::screens()) {
+        QCocoaScreen *cocoaScreen = static_cast<QCocoaScreen*>(screen->handle());
+        if (cocoaScreen->m_displayId == displayId)
+            return cocoaScreen;
+    }
+
+    return nullptr;
+}
+
+NSScreen *QCocoaScreen::nativeScreen() const
+{
+    if (!m_displayId)
+        return nil; // The display has been disconnected
+
+    // A single display may have different displayIds depending on
+    // which GPU is in use or which physical port the display is
+    // connected to. By comparing UUIDs instead of display IDs we
+    // ensure that we always pick up the appropriate NSScreen.
+    QCFType<CFUUIDRef> uuid = CGDisplayCreateUUIDFromDisplayID(m_displayId);
+
+    for (NSScreen *screen in [NSScreen screens]) {
+        if (CGDisplayCreateUUIDFromDisplayID(screen.qt_displayId) == uuid)
+            return screen;
+    }
+
+    qCWarning(lcQpaScreen) << "Could not find NSScreen for display ID" << m_displayId;
+    return nil;
 }
 
 CGPoint QCocoaScreen::mapToNative(const QPointF &pos, QCocoaScreen *screen)
@@ -533,11 +636,10 @@ QDebug operator<<(QDebug debug, const QCocoaScreen *screen)
     debug.nospace();
     debug << "QCocoaScreen(" << (const void *)screen;
     if (screen) {
-        debug << ", index=" << screen->m_screenIndex;
-        debug << ", native=" << screen->nativeScreen();
         debug << ", geometry=" << screen->geometry();
         debug << ", dpr=" << screen->devicePixelRatio();
         debug << ", name=" << screen->name();
+        debug << ", native=" << screen->nativeScreen();
     }
     debug << ')';
     return debug;
diff --git a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
index 4982f5ee05..de5cf85854 100644
--- a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
+++ b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
@@ -383,9 +383,9 @@ QT_END_NAMESPACE
 }
 
 - (QRectF)geometry {
-    if (NSWindow *window = [[item view] window]) {
-        if (QCocoaScreen *screen = QCocoaIntegration::instance()->screenForNSScreen([window screen]))
-            return screen->mapFromNative([window frame]);
+    if (NSWindow *window = item.view.window) {
+        if (QCocoaScreen *screen = QCocoaScreen::get(window.screen))
+            return screen->mapFromNative(window.frame);
     }
     return QRectF();
 }
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 298d11fe08..67b0cbdfe9 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -1086,9 +1086,11 @@ void QCocoaWindow::setEmbeddedInForeignView()
 
 void QCocoaWindow::viewDidChangeFrame()
 {
-    if (isContentView())
-        return; // Handled below
-
+    // Note: When the view is the content view, it would seem redundant
+    // to deliver geometry changes both from windowDidResize and this
+    // callback, but in some cases such as when macOS native tabbed
+    // windows are enabled we may end up with the wrong geometry in
+    // the initial windowDidResize callback when a new tab is created.
     handleGeometryChange();
 }
 
@@ -1208,23 +1210,34 @@ void QCocoaWindow::windowDidChangeScreen()
     if (!window())
         return;
 
-    const bool wasRunningDisplayLink = static_cast<QCocoaScreen *>(screen())->isRunningDisplayLink();
-
-    if (QCocoaScreen *newScreen = QCocoaIntegration::instance()->screenForNSScreen(m_view.window.screen)) {
-        if (newScreen == screen()) {
-            // Screen properties have changed. Will be handled by
-            // NSApplicationDidChangeScreenParametersNotification
-            // in QCocoaIntegration::updateScreens().
-            return;
-        }
-
-        qCDebug(lcQpaWindow) << window() << "moved to" << newScreen;
-        QWindowSystemInterface::handleWindowScreenChanged<QWindowSystemInterface::SynchronousDelivery>(window(), newScreen->screen());
-
-        if (hasPendingUpdateRequest() && wasRunningDisplayLink)
-            requestUpdate(); // Restart display-link on new screen
-    } else {
-        qCWarning(lcQpaWindow) << "Failed to get QCocoaScreen for" << m_view.window.screen;
+    // Note: When a window is resized to 0x0 Cocoa will report the window's screen as nil
+    auto *currentScreen = QCocoaScreen::get(m_view.window.screen);
+    auto *previousScreen = static_cast<QCocoaScreen*>(screen());
+
+    Q_ASSERT_X(!m_view.window.screen || currentScreen,
+        "QCocoaWindow", "Failed to get QCocoaScreen for NSScreen");
+
+    // Note: The previous screen may be the same as the current screen, either because
+    // a) the screen was just reconfigured, which still results in AppKit sending an
+    // NSWindowDidChangeScreenNotification, b) because the previous screen was removed,
+    // and we ended up calling QWindow::setScreen to move the window, which doesn't
+    // actually move the window to the new screen, or c) because we've delivered the
+    // screen change to the top level window, which will make all the child windows
+    // of that window report the new screen when requested via QWindow::screen().
+    // We still need to deliver the screen change in all these cases, as the
+    // device-pixel ratio may have changed, and needs to be delivered to all
+    // windows, both top level and child windows.
+
+    qCDebug(lcQpaWindow) << "Screen changed for" << window() << "from" << previousScreen << "to" << currentScreen;
+    QWindowSystemInterface::handleWindowScreenChanged<QWindowSystemInterface::SynchronousDelivery>(
+        window(), currentScreen ? currentScreen->screen() : nullptr);
+
+    if (currentScreen && hasPendingUpdateRequest()) {
+        // Restart display-link on new screen. We need to do this unconditionally,
+        // since we can't rely on the previousScreen reflecting whether or not the
+        // window actually moved from one screen to another, or just stayed on the
+        // same screen.
+        currentScreen->requestUpdate();
     }
 }
 
diff --git a/src/plugins/platforms/cocoa/qmacclipboard.mm b/src/plugins/platforms/cocoa/qmacclipboard.mm
index ba6cfca219..358a6b49fd 100644
--- a/src/plugins/platforms/cocoa/qmacclipboard.mm
+++ b/src/plugins/platforms/cocoa/qmacclipboard.mm
@@ -489,19 +489,16 @@ QMacPasteboard::retrieveData(const QString &format, QVariant::Type) const
         QMacInternalPasteboardMime *c = mimes.at(mime);
         QString c_flavor = c->flavorFor(format);
         if (!c_flavor.isEmpty()) {
-            // Handle text/plain a little differently. Try handling Unicode first.
-            bool checkForUtf16 = (c_flavor == QLatin1String("com.apple.traditional-mac-plain-text")
-                                  || c_flavor == QLatin1String("public.utf8-plain-text"));
-            if (checkForUtf16 || c_flavor == QLatin1String("public.utf16-plain-text")) {
-                // Try to get the NSStringPboardType from NSPasteboard, newlines are mapped
-                // correctly (as '\n') in this data. The 'public.utf16-plain-text' type
-                // usually maps newlines to '\r' instead.
+            // Converting via PasteboardCopyItemFlavorData below will for some UITs result
+            // in newlines mapping to '\r' instead of '\n'. To work around this we shortcut
+            // the conversion via NSPasteboard's NSStringPboardType if possible.
+            if (c_flavor == QLatin1String("com.apple.traditional-mac-plain-text")
+             || c_flavor == QLatin1String("public.utf8-plain-text")
+             || c_flavor == QLatin1String("public.utf16-plain-text")) {
                 QString str = qt_mac_get_pasteboardString(paste);
                 if (!str.isEmpty())
                     return str;
             }
-            if (checkForUtf16 && hasFlavor(QLatin1String("public.utf16-plain-text")))
-                c_flavor = QLatin1String("public.utf16-plain-text");
 
             QVariant ret;
             QList<QByteArray> retList;
diff --git a/src/plugins/platforms/cocoa/qnsview_drawing.mm b/src/plugins/platforms/cocoa/qnsview_drawing.mm
index 69d36ef61e..d2e6f848a0 100644
--- a/src/plugins/platforms/cocoa/qnsview_drawing.mm
+++ b/src/plugins/platforms/cocoa/qnsview_drawing.mm
@@ -189,6 +189,15 @@
 
 - (void)displayLayer:(CALayer *)layer
 {
+    if (!NSThread.isMainThread) {
+        // Qt is calling AppKit APIs such as -[NSOpenGLContext setView:] on secondary threads,
+        // which we shouldn't do. This may result in AppKit (wrongly) triggering a display on
+        // the thread where we made the call, so block it here and defer to the main thread.
+        qCWarning(lcQpaDrawing) << "Display non non-main thread! Deferring to main thread";
+        dispatch_async(dispatch_get_main_queue(), ^{ self.needsDisplay = YES; });
+        return;
+    }
+
     Q_ASSERT(layer == self.layer);
 
     if (!m_platformWindow)
diff --git a/src/plugins/platforms/cocoa/qnsview_mouse.mm b/src/plugins/platforms/cocoa/qnsview_mouse.mm
index 0ab09b97d3..4408385aa8 100644
--- a/src/plugins/platforms/cocoa/qnsview_mouse.mm
+++ b/src/plugins/platforms/cocoa/qnsview_mouse.mm
@@ -147,9 +147,34 @@
 
     ulong timestamp = [theEvent timestamp] * 1000;
 
-    auto eventType = cocoaEvent2QtMouseEvent(theEvent);
-    qCInfo(lcQpaMouse) << "Frame-strut" << eventType << "at" << qtWindowPoint << "with" << m_frameStrutButtons << "in" << self.window;
-    QWindowSystemInterface::handleFrameStrutMouseEvent(m_platformWindow->window(), timestamp, qtWindowPoint, qtScreenPoint, m_frameStrutButtons);
+    const auto button = cocoaButton2QtButton(theEvent);
+    auto eventType = [&]() {
+        switch (theEvent.type) {
+        case NSEventTypeLeftMouseDown:
+        case NSEventTypeRightMouseDown:
+        case NSEventTypeOtherMouseDown:
+            return QEvent::NonClientAreaMouseButtonPress;
+
+        case NSEventTypeLeftMouseUp:
+        case NSEventTypeRightMouseUp:
+        case NSEventTypeOtherMouseUp:
+            return QEvent::NonClientAreaMouseButtonRelease;
+
+        case NSEventTypeLeftMouseDragged:
+        case NSEventTypeRightMouseDragged:
+        case NSEventTypeOtherMouseDragged:
+            return QEvent::NonClientAreaMouseMove;
+
+        default:
+            break;
+        }
+
+        return QEvent::None;
+    }();
+
+    qCInfo(lcQpaMouse) << eventType << "at" << qtWindowPoint << "with" << m_frameStrutButtons << "in" << self.window;
+    QWindowSystemInterface::handleFrameStrutMouseEvent(m_platformWindow->window(),
+        timestamp, qtWindowPoint, qtScreenPoint, m_frameStrutButtons, button, eventType);
 }
 @end
 
@@ -477,12 +502,15 @@
     // uses the legacy cursorRect API, so the cursor is reset to the arrow
     // cursor. See rdar://34183708
 
-    if (self.cursor && self.cursor != NSCursor.currentCursor) {
-        qCInfo(lcQpaMouse) << "Updating cursor for" << self << "to" << self.cursor;
+    auto previousCursor = NSCursor.currentCursor;
+
+    if (self.cursor)
         [self.cursor set];
-    } else {
+    else
         [super cursorUpdate:theEvent];
-    }
+
+    if (NSCursor.currentCursor != previousCursor)
+        qCInfo(lcQpaMouse) << "Cursor update for" << self << "resulted in new cursor" << NSCursor.currentCursor;
 }
 
 - (void)mouseMovedImpl:(NSEvent *)theEvent
diff --git a/src/plugins/platforms/cocoa/qnswindowdelegate.mm b/src/plugins/platforms/cocoa/qnswindowdelegate.mm
index 087cb3651f..9502a315d8 100644
--- a/src/plugins/platforms/cocoa/qnswindowdelegate.mm
+++ b/src/plugins/platforms/cocoa/qnswindowdelegate.mm
@@ -51,7 +51,9 @@ static QRegExp whitespaceRegex = QRegExp(QStringLiteral("\\s*"));
 
 static QCocoaWindow *toPlatformWindow(NSWindow *window)
 {
-    return qnsview_cast(window.contentView).platformWindow;
+    if ([window conformsToProtocol:@protocol(QNSWindowProtocol)])
+        return static_cast<QCocoaNSWindow *>(window).platformWindow;
+    return nullptr;
 }
 
 @implementation QNSWindowDelegate
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
index f72ea2b038..6d4d47e3da 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dbackingstore.h
@@ -48,7 +48,7 @@ class QWindowsDirect2DWindow;
 
 class QWindowsDirect2DBackingStore : public QPlatformBackingStore
 {
-    Q_DISABLE_COPY(QWindowsDirect2DBackingStore)
+    Q_DISABLE_COPY_MOVE(QWindowsDirect2DBackingStore)
 
 public:
     QWindowsDirect2DBackingStore(QWindow *window);
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dbitmap.h b/src/plugins/platforms/direct2d/qwindowsdirect2dbitmap.h
index d8a8a49aec..8fd683106d 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dbitmap.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dbitmap.h
@@ -59,7 +59,7 @@ class QColor;
 class QWindowsDirect2DBitmap
 {
     Q_DECLARE_PRIVATE(QWindowsDirect2DBitmap)
-    Q_DISABLE_COPY(QWindowsDirect2DBitmap)
+    Q_DISABLE_COPY_MOVE(QWindowsDirect2DBitmap)
 public:
     QWindowsDirect2DBitmap();
     QWindowsDirect2DBitmap(ID2D1Bitmap1 *bitmap, ID2D1DeviceContext *dc);
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2ddevicecontext.h b/src/plugins/platforms/direct2d/qwindowsdirect2ddevicecontext.h
index aee0eb867d..a28c674671 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2ddevicecontext.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2ddevicecontext.h
@@ -91,7 +91,7 @@ private:
 };
 
 class QWindowsDirect2DDeviceContextSuspender {
-    Q_DISABLE_COPY(QWindowsDirect2DDeviceContextSuspender)
+    Q_DISABLE_COPY_MOVE(QWindowsDirect2DDeviceContextSuspender)
 
     QWindowsDirect2DDeviceContext *m_dc;
 public:
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp
index fa201c784e..1b82db0b37 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.cpp
@@ -1800,7 +1800,7 @@ void QWindowsDirect2DPaintEngine::resume()
 
 class QWindowsDirect2DPaintEngineSuspenderImpl
 {
-    Q_DISABLE_COPY(QWindowsDirect2DPaintEngineSuspenderImpl)
+    Q_DISABLE_COPY_MOVE(QWindowsDirect2DPaintEngineSuspenderImpl)
     QWindowsDirect2DPaintEngine *m_engine;
     bool m_active;
 public:
diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.h b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.h
index 6404c60b13..f61e908bce 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.h
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintengine.h
@@ -128,7 +128,7 @@ Q_DECLARE_OPERATORS_FOR_FLAGS(QWindowsDirect2DPaintEngine::Flags)
 class QWindowsDirect2DPaintEngineSuspenderPrivate;
 class QWindowsDirect2DPaintEngineSuspender
 {
-    Q_DISABLE_COPY(QWindowsDirect2DPaintEngineSuspender)
+    Q_DISABLE_COPY_MOVE(QWindowsDirect2DPaintEngineSuspender)
     Q_DECLARE_PRIVATE(QWindowsDirect2DPaintEngineSuspender)
     QScopedPointer<QWindowsDirect2DPaintEngineSuspenderPrivate> d_ptr;
 public:
diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_openwfd/qeglfsopenwfdintegration.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_openwfd/qeglfsopenwfdintegration.cpp
index 738c30c65a..b8f04cf978 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_openwfd/qeglfsopenwfdintegration.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_openwfd/qeglfsopenwfdintegration.cpp
@@ -221,7 +221,7 @@ EGLNativeWindowType QEglFSOpenWFDIntegration::createNativeWindow(QPlatformWindow
 
 QSurfaceFormat QEglFSOpenWFDIntegration::surfaceFormatFor(const QSurfaceFormat &inputFormat) const
 {
-    QSurfaceFormat format;
+    QSurfaceFormat format = inputFormat;
     format.setRedBufferSize(8);
     format.setGreenBufferSize(8);
     format.setBlueBufferSize(8);
diff --git a/src/plugins/platforms/ios/qiostextinputoverlay.mm b/src/plugins/platforms/ios/qiostextinputoverlay.mm
index e5419b1766..0561a826c6 100644
--- a/src/plugins/platforms/ios/qiostextinputoverlay.mm
+++ b/src/plugins/platforms/ios/qiostextinputoverlay.mm
@@ -834,9 +834,14 @@ static void executeBlockWithoutAnimation(Block block)
 - (void)updateSelection
 {
     if (!hasSelection()) {
-        _cursorLayer.visible = NO;
-        _anchorLayer.visible = NO;
-        QIOSTextInputOverlay::s_editMenu.visible = NO;
+        if (_cursorLayer.visible) {
+            _cursorLayer.visible = NO;
+            _anchorLayer.visible = NO;
+            // Only hide the edit menu if we had a selection from before, since
+            // the edit menu can also be used for other purposes by others (in
+            // which case we try our best not to interfere).
+            QIOSTextInputOverlay::s_editMenu.visible = NO;
+        }
         return;
     }
 
diff --git a/src/plugins/platforms/openwfd/qopenwfdscreen.h b/src/plugins/platforms/openwfd/qopenwfdscreen.h
index dede0025a9..dec51d306b 100644
--- a/src/plugins/platforms/openwfd/qopenwfdscreen.h
+++ b/src/plugins/platforms/openwfd/qopenwfdscreen.h
@@ -48,7 +48,6 @@
 #include <WF/wfd.h>
 
 #include <QtCore/QVarLengthArray>
-#include <QtCore/QLinkedList>
 
 #define BUFFER_NUM 4
 
diff --git a/src/plugins/platforms/qnx/qqnxintegration.cpp b/src/plugins/platforms/qnx/qqnxintegration.cpp
index d9120256b3..f479e94988 100644
--- a/src/plugins/platforms/qnx/qqnxintegration.cpp
+++ b/src/plugins/platforms/qnx/qqnxintegration.cpp
@@ -607,12 +607,11 @@ QList<screen_display_t *> QQnxIntegration::sortDisplays(screen_display_t *availa
 
         // Move all displays with matching ID from the intermediate list
         // to the beginning of the ordered list
-        QMutableListIterator<screen_display_t *> iter(allDisplays);
-        while (iter.hasNext()) {
-            screen_display_t *display = iter.next();
+        for (auto it = allDisplays.begin(), end = allDisplays.end(); it != end; ++it) {
+            screen_display_t *display = *it;
             if (getIdOfDisplay(*display) == requestedValue) {
                 orderedDisplays.append(display);
-                iter.remove();
+                allDisplays.erase(it);
                 break;
             }
         }
diff --git a/src/plugins/platforms/wasm/qtloader.js b/src/plugins/platforms/wasm/qtloader.js
index 4752a1dcee..ef4a6ec2b9 100644
--- a/src/plugins/platforms/wasm/qtloader.js
+++ b/src/plugins/platforms/wasm/qtloader.js
@@ -124,6 +124,8 @@
 //      Remove canvas at run-time. Removes the corresponding QScreen.
 // resizeCanvasElement
 //      Signals to the application that a canvas has been resized.
+// setFontDpi
+//      Sets the logical font dpi for the application.
 
 
 var Module = {}
@@ -237,6 +239,8 @@ function QtLoader(config)
     publicAPI.addCanvasElement = addCanvasElement;
     publicAPI.removeCanvasElement = removeCanvasElement;
     publicAPI.resizeCanvasElement = resizeCanvasElement;
+    publicAPI.setFontDpi = setFontDpi;
+    publicAPI.fontDpi = fontDpi;
 
     restartCount = 0;
 
@@ -557,6 +561,16 @@ function QtLoader(config)
             Module.qtResizeCanvasElement(element);
     }
 
+    function setFontDpi(dpi) {
+        Module.qtFontDpi = dpi;
+        if (publicAPI.status == "Running")
+            Module.qtSetFontDpi(dpi);
+    }
+
+    function fontDpi() {
+        return Module.qtFontDpi;
+    }
+
     setStatus("Created");
 
     return publicAPI;
diff --git a/src/plugins/platforms/wasm/qwasmfontdatabase.cpp b/src/plugins/platforms/wasm/qwasmfontdatabase.cpp
index 0c72dfddc4..dc6bb5847e 100644
--- a/src/plugins/platforms/wasm/qwasmfontdatabase.cpp
+++ b/src/plugins/platforms/wasm/qwasmfontdatabase.cpp
@@ -38,9 +38,9 @@ void QWasmFontDatabase::populateFontDatabase()
     // Load font file from resources. Currently
     // all fonts needs to be bundled with the nexe
     // as Qt resources.
-    QStringList fontFileNames = QStringList() << QStringLiteral(":/fonts/Vera.ttf")
+    QStringList fontFileNames = QStringList() << QStringLiteral(":/fonts/DejaVuSansMono.ttf")
+                                              << QStringLiteral(":/fonts/Vera.ttf")
                                               << QStringLiteral(":/fonts/DejaVuSans.ttf");
-
     foreach (const QString &fontFileName, fontFileNames) {
         QFile theFont(fontFileName);
         if (!theFont.open(QIODevice::ReadOnly))
@@ -82,5 +82,9 @@ void QWasmFontDatabase::releaseHandle(void *handle)
     QFreeTypeFontDatabase::releaseHandle(handle);
 }
 
+QFont QWasmFontDatabase::defaultFont() const
+{
+    return QFont(QLatin1String("Bitstream Vera Sans"));
+}
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmfontdatabase.h b/src/plugins/platforms/wasm/qwasmfontdatabase.h
index 891f12859e..cbd187a022 100644
--- a/src/plugins/platforms/wasm/qwasmfontdatabase.h
+++ b/src/plugins/platforms/wasm/qwasmfontdatabase.h
@@ -44,6 +44,7 @@ public:
                                    QChar::Script script) const override;
     QStringList addApplicationFont(const QByteArray &fontData, const QString &fileName) override;
     void releaseHandle(void *handle) override;
+    QFont defaultFont() const override;
 };
 QT_END_NAMESPACE
 #endif
diff --git a/src/plugins/platforms/wasm/qwasmintegration.cpp b/src/plugins/platforms/wasm/qwasmintegration.cpp
index e601d553f2..31b9104de1 100644
--- a/src/plugins/platforms/wasm/qwasmintegration.cpp
+++ b/src/plugins/platforms/wasm/qwasmintegration.cpp
@@ -48,8 +48,10 @@
 #include <QtGui/qscreen.h>
 #include <qpa/qwindowsysteminterface.h>
 #include <QtCore/qcoreapplication.h>
+#include <qpa/qplatforminputcontextfactory_p.h>
 
 #include <emscripten/bind.h>
+#include <emscripten/val.h>
 
 // this is where EGL headers are pulled in, make sure it is last
 #include "qwasmscreen.h"
@@ -80,12 +82,18 @@ static void resizeCanvasElement(emscripten::val canvas)
     QWasmIntegration::get()->resizeScreen(canvasId);
 }
 
+static void qtUpdateDpi()
+{
+    QWasmIntegration::get()->updateDpi();
+}
+
 EMSCRIPTEN_BINDINGS(qtQWasmIntegraton)
 {
     function("qtBrowserBeforeUnload", &browserBeforeUnload);
     function("qtAddCanvasElement", &addCanvasElement);
     function("qtRemoveCanvasElement", &removeCanvasElement);
     function("qtResizeCanvasElement", &resizeCanvasElement);
+    function("qtUpdateDpi", &qtUpdateDpi);
 }
 
 QWasmIntegration *QWasmIntegration::s_instance;
@@ -173,6 +181,18 @@ QPlatformOpenGLContext *QWasmIntegration::createPlatformOpenGLContext(QOpenGLCon
 }
 #endif
 
+void QWasmIntegration::initialize()
+{
+    QString icStr = QPlatformInputContextFactory::requested();
+    if (!icStr.isNull())
+        m_inputContext.reset(QPlatformInputContextFactory::create(icStr));
+}
+
+QPlatformInputContext *QWasmIntegration::inputContext() const
+{
+    return m_inputContext.data();
+}
+
 QPlatformFontDatabase *QWasmIntegration::fontDatabase() const
 {
     if (m_fontDb == nullptr)
@@ -245,4 +265,14 @@ void QWasmIntegration::resizeScreen(const QString &canvasId)
     m_screens.value(canvasId)->updateQScreenAndCanvasRenderSize();
 }
 
+void QWasmIntegration::updateDpi()
+{
+    emscripten::val dpi = emscripten::val::module_property("qtFontDpi");
+    if (dpi.isUndefined())
+        return;
+    qreal dpiValue = dpi.as<qreal>();
+    for (QWasmScreen *screen : m_screens)
+        QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(screen->screen(), dpiValue, dpiValue);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmintegration.h b/src/plugins/platforms/wasm/qwasmintegration.h
index 11d8d0f7f5..c04c0eaecc 100644
--- a/src/plugins/platforms/wasm/qwasmintegration.h
+++ b/src/plugins/platforms/wasm/qwasmintegration.h
@@ -34,6 +34,7 @@
 
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformscreen.h>
+#include <qpa/qplatforminputcontext.h>
 
 #include <QtCore/qhash.h>
 
@@ -73,6 +74,9 @@ public:
     QPlatformTheme *createPlatformTheme(const QString &name) const override;
     QPlatformServices *services() const override;
     QPlatformClipboard *clipboard() const override;
+    void initialize() override;
+    QPlatformInputContext *inputContext() const override;
+
     QWasmClipboard *getWasmClipboard() { return m_clipboard; }
 
     static QWasmIntegration *get() { return s_instance; }
@@ -81,6 +85,7 @@ public:
     void addScreen(const QString &canvasId);
     void removeScreen(const QString &canvasId);
     void resizeScreen(const QString &canvasId);
+    void updateDpi();
 
 private:
     mutable QWasmFontDatabase *m_fontDb;
@@ -89,6 +94,8 @@ private:
 
     QHash<QString, QWasmScreen *> m_screens;
     mutable QWasmClipboard *m_clipboard;
+    qreal m_fontDpi = -1;
+    mutable QScopedPointer<QPlatformInputContext> m_inputContext;
     static QWasmIntegration *s_instance;
 };
 
diff --git a/src/plugins/platforms/wasm/qwasmopenglcontext.cpp b/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
index ae43e2ebf0..1658f32f9e 100644
--- a/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
+++ b/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
@@ -37,6 +37,14 @@ QWasmOpenGLContext::QWasmOpenGLContext(const QSurfaceFormat &format)
     : m_requestedFormat(format)
 {
     m_requestedFormat.setRenderableType(QSurfaceFormat::OpenGLES);
+
+    // if we set one, we need to set the other as well since in webgl, these are tied together
+    if (format.depthBufferSize() < 0 && format.stencilBufferSize() > 0)
+       m_requestedFormat.setDepthBufferSize(16);
+
+   if (format.stencilBufferSize() < 0 && format.depthBufferSize() > 0)
+       m_requestedFormat.setStencilBufferSize(8);
+
 }
 
 QWasmOpenGLContext::~QWasmOpenGLContext()
@@ -91,10 +99,14 @@ EMSCRIPTEN_WEBGL_CONTEXT_HANDLE QWasmOpenGLContext::createEmscriptenContext(cons
         attributes.majorVersion = 2;
     }
 
+    // WebGL doesn't allow separate attach buffers to STENCIL_ATTACHMENT and DEPTH_ATTACHMENT
+    // we need both or none
+    bool useDepthStencil = (format.depthBufferSize() > 0 || format.stencilBufferSize() > 0);
+
     // WebGL offers enable/disable control but not size control for these
     attributes.alpha = format.alphaBufferSize() > 0;
-    attributes.depth = format.depthBufferSize() > 0;
-    attributes.stencil = format.stencilBufferSize() > 0;
+    attributes.depth = useDepthStencil;
+    attributes.stencil = useDepthStencil;
 
     EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context(canvasId.toLocal8Bit().constData(), &attributes);
 
diff --git a/src/plugins/platforms/wasm/qwasmscreen.cpp b/src/plugins/platforms/wasm/qwasmscreen.cpp
index a26cafa900..af50ce7440 100644
--- a/src/plugins/platforms/wasm/qwasmscreen.cpp
+++ b/src/plugins/platforms/wasm/qwasmscreen.cpp
@@ -31,6 +31,7 @@
 #include "qwasmwindow.h"
 #include "qwasmeventtranslator.h"
 #include "qwasmcompositor.h"
+#include "qwasmintegration.h"
 #include <emscripten/bind.h>
 #include <emscripten/val.h>
 
@@ -100,6 +101,17 @@ QImage::Format QWasmScreen::format() const
     return m_format;
 }
 
+QDpi QWasmScreen::logicalDpi() const
+{
+    emscripten::val dpi = emscripten::val::module_property("qtFontDpi");
+    if (!dpi.isUndefined()) {
+        qreal dpiValue = dpi.as<qreal>();
+        return QDpi(dpiValue, dpiValue);
+    }
+    const qreal defaultDpi = 96;
+    return QDpi(defaultDpi, defaultDpi);
+}
+
 qreal QWasmScreen::devicePixelRatio() const
 {
     // FIXME: The effective device pixel ratio may be different from the
diff --git a/src/plugins/platforms/wasm/qwasmscreen.h b/src/plugins/platforms/wasm/qwasmscreen.h
index 82d2a83edb..8d0d15f245 100644
--- a/src/plugins/platforms/wasm/qwasmscreen.h
+++ b/src/plugins/platforms/wasm/qwasmscreen.h
@@ -63,6 +63,7 @@ public:
     QRect geometry() const override;
     int depth() const override;
     QImage::Format format() const override;
+    QDpi logicalDpi() const override;
     qreal devicePixelRatio() const override;
     QString name() const override;
     QPlatformCursor *cursor() const override;
diff --git a/src/plugins/platforms/wasm/qwasmtheme.cpp b/src/plugins/platforms/wasm/qwasmtheme.cpp
index a7f2db3bd3..978d60d686 100644
--- a/src/plugins/platforms/wasm/qwasmtheme.cpp
+++ b/src/plugins/platforms/wasm/qwasmtheme.cpp
@@ -29,15 +29,22 @@
 
 #include "qwasmtheme.h"
 #include <QtCore/qvariant.h>
+#include <QFontDatabase>
 
 QT_BEGIN_NAMESPACE
 
 QWasmTheme::QWasmTheme()
 {
+    QFontDatabase fdb;
+    for (auto family : fdb.families())
+        if (fdb.isFixedPitch(family))
+            fixedFont = new QFont(family);
 }
 
 QWasmTheme::~QWasmTheme()
 {
+    if (fixedFont)
+        delete fixedFont;
 }
 
 QVariant QWasmTheme::themeHint(ThemeHint hint) const
@@ -47,4 +54,12 @@ QVariant QWasmTheme::themeHint(ThemeHint hint) const
     return QPlatformTheme::themeHint(hint);
 }
 
+const QFont *QWasmTheme::font(Font type) const
+{
+    if (type == QPlatformTheme::FixedFont) {
+        return fixedFont;
+    }
+    return nullptr;
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmtheme.h b/src/plugins/platforms/wasm/qwasmtheme.h
index e4cc06e049..7123a1f3d4 100644
--- a/src/plugins/platforms/wasm/qwasmtheme.h
+++ b/src/plugins/platforms/wasm/qwasmtheme.h
@@ -31,6 +31,7 @@
 #define QWASMTHEME_H
 
 #include <qpa/qplatformtheme.h>
+#include <QtGui/QFont>
 
 QT_BEGIN_NAMESPACE
 
@@ -49,6 +50,8 @@ public:
     ~QWasmTheme();
 
     QVariant themeHint(ThemeHint hint) const override;
+    const QFont *font(Font type) const override;
+    QFont *fixedFont = nullptr;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/wasm.pro b/src/plugins/platforms/wasm/wasm.pro
index 9b98445c68..e8728d9dba 100644
--- a/src/plugins/platforms/wasm/wasm.pro
+++ b/src/plugins/platforms/wasm/wasm.pro
@@ -39,7 +39,8 @@ HEADERS = \
 
 wasmfonts.files = \
     ../../../3rdparty/wasm/Vera.ttf \
-    ../../../3rdparty/wasm/DejaVuSans.ttf
+    ../../../3rdparty/wasm/DejaVuSans.ttf \
+    ../../../3rdparty/wasm/DejaVuSansMono.ttf
 wasmfonts.prefix = /fonts
 wasmfonts.base = ../../../3rdparty/wasm
 RESOURCES += wasmfonts
diff --git a/src/plugins/platforms/wasm/wasm_shell.html b/src/plugins/platforms/wasm/wasm_shell.html
index f7c856d63d..a118c217f3 100644
--- a/src/plugins/platforms/wasm/wasm_shell.html
+++ b/src/plugins/platforms/wasm/wasm_shell.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="utf-8">
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-    <title>APPNAME</title>
+    <title>@APPNAME@</title>
     <style>
       html, body { padding: 0; margin : 0; overflow:hidden; height: 100% }
       /* the canvas *must not* have any border or padding, or mouse coords will be wrong */
@@ -18,7 +18,7 @@
     <figure style="overflow:visible;" id="qtspinner">
       <center style="margin-top:1.5em; line-height:150%">
         <img src="qtlogo.svg"; width=320; height=200; style="display:block"> </img>
-        <strong>Qt for WebAssembly: APPNAME</strong>
+        <strong>Qt for WebAssembly: @APPNAME@</strong>
         <div id="qtstatus"></div>
         <noscript>JavaScript is disabled. Please enable JavaScript to use this application.</noscript>
       </center>
@@ -57,7 +57,7 @@
                   canvas.style.display = 'block';
               },
           });
-          qtLoader.loadEmscriptenModule("APPNAME");
+          qtLoader.loadEmscriptenModule("@APPNAME@");
       }
     </script>
     <script type="text/javascript" src="qtloader.js"></script>
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.h b/src/plugins/platforms/windows/qwindowsbackingstore.h
index 088ab3b257..b96c8f0e61 100644
--- a/src/plugins/platforms/windows/qwindowsbackingstore.h
+++ b/src/plugins/platforms/windows/qwindowsbackingstore.h
@@ -52,7 +52,7 @@ class QWindowsNativeImage;
 
 class QWindowsBackingStore : public QPlatformBackingStore
 {
-    Q_DISABLE_COPY(QWindowsBackingStore)
+    Q_DISABLE_COPY_MOVE(QWindowsBackingStore)
 public:
     QWindowsBackingStore(QWindow *window);
     ~QWindowsBackingStore() override;
diff --git a/src/plugins/platforms/windows/qwindowsclipboard.h b/src/plugins/platforms/windows/qwindowsclipboard.h
index 469d638b89..24a6bc908d 100644
--- a/src/plugins/platforms/windows/qwindowsclipboard.h
+++ b/src/plugins/platforms/windows/qwindowsclipboard.h
@@ -58,7 +58,7 @@ protected:
 
 class QWindowsClipboard : public QPlatformClipboard
 {
-    Q_DISABLE_COPY(QWindowsClipboard)
+    Q_DISABLE_COPY_MOVE(QWindowsClipboard)
 public:
     QWindowsClipboard();
     ~QWindowsClipboard() override;
@@ -87,8 +87,8 @@ private:
 
     QWindowsClipboardRetrievalMimeData m_retrievalData;
     QWindowsOleDataObject *m_data = nullptr;
-    HWND m_clipboardViewer = 0;
-    HWND m_nextClipboardViewer = 0;
+    HWND m_clipboardViewer = nullptr;
+    HWND m_nextClipboardViewer = nullptr;
     bool m_formatListenerRegistered = false;
 };
 
diff --git a/src/plugins/platforms/windows/qwindowscombase.h b/src/plugins/platforms/windows/qwindowscombase.h
index 6b25d665dc..45cba9c68b 100644
--- a/src/plugins/platforms/windows/qwindowscombase.h
+++ b/src/plugins/platforms/windows/qwindowscombase.h
@@ -80,7 +80,7 @@ bool qWindowsComQueryUnknownInterfaceMulti(Derived *d, REFIID id, LPVOID *iface)
 // Helper base class to provide IUnknown methods for COM classes (single inheritance)
 template <class ComInterface> class QWindowsComBase : public ComInterface
 {
-    Q_DISABLE_COPY(QWindowsComBase)
+    Q_DISABLE_COPY_MOVE(QWindowsComBase)
 public:
     explicit QWindowsComBase(ULONG initialRefCount = 1) : m_ref(initialRefCount) {}
     virtual ~QWindowsComBase() = default;
diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index 9ab9c2708b..9be6d4ced7 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -210,6 +210,7 @@ void QWindowsUser32DLL::init()
 
     if (QOperatingSystemVersion::current()
         >= QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 14393)) {
+        adjustWindowRectExForDpi = (AdjustWindowRectExForDpi)library.resolve("AdjustWindowRectExForDpi");
         enableNonClientDpiScaling = (EnableNonClientDpiScaling)library.resolve("EnableNonClientDpiScaling");
         getWindowDpiAwarenessContext = (GetWindowDpiAwarenessContext)library.resolve("GetWindowDpiAwarenessContext");
         getAwarenessFromDpiAwarenessContext = (GetAwarenessFromDpiAwarenessContext)library.resolve("GetAwarenessFromDpiAwarenessContext");
@@ -712,7 +713,7 @@ static inline bool findPlatformWindowHelper(const POINT &screenPoint, unsigned c
                                             HWND *hwnd, QWindowsWindow **result)
 {
     POINT point = screenPoint;
-    ScreenToClient(*hwnd, &point);
+    screenToClient(*hwnd, &point);
     // Returns parent if inside & none matched.
     const HWND child = ChildWindowFromPointEx(*hwnd, point, cwexFlags);
     if (!child || child == *hwnd)
@@ -977,7 +978,7 @@ static inline bool resizeOnDpiChanged(const QWindow *w)
     return result;
 }
 
-static bool shouldHaveNonClientDpiScaling(const QWindow *window)
+bool QWindowsContext::shouldHaveNonClientDpiScaling(const QWindow *window)
 {
     return QOperatingSystemVersion::current() >= QOperatingSystemVersion::Windows10
         && window->isTopLevel()
@@ -1042,7 +1043,7 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
         // For non-client-area messages, these are screen coordinates (as expected
         // in the MSG structure), otherwise they are client coordinates.
         if (!(et & QtWindows::NonClientEventFlag)) {
-            ClientToScreen(msg.hwnd, &msg.pt);
+            clientToScreen(msg.hwnd, &msg.pt);
         }
     } else {
         GetCursorPos(&msg.pt);
@@ -1133,13 +1134,11 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
         case QtWindows::QuerySizeHints:
             d->m_creationContext->applyToMinMaxInfo(reinterpret_cast<MINMAXINFO *>(lParam));
             return true;
-        case QtWindows::ResizeEvent: {
-            const QSize size(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) - d->m_creationContext->menuHeight);
-            d->m_creationContext->obtainedGeometry.setSize(size);
-        }
+        case QtWindows::ResizeEvent:
+            d->m_creationContext->obtainedSize = QSize(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
             return true;
         case QtWindows::MoveEvent:
-            d->m_creationContext->obtainedGeometry.moveTo(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
+            d->m_creationContext->obtainedPos = QPoint(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
             return true;
         case QtWindows::NonClientCreate:
             if (shouldHaveNonClientDpiScaling(d->m_creationContext->window))
@@ -1321,15 +1320,24 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
 #endif
     }   break;
     case QtWindows::DpiChangedEvent: {
-        if (!resizeOnDpiChanged(platformWindow->window()))
-            return false;
-        platformWindow->setFlag(QWindowsWindow::WithinDpiChanged);
-        const RECT *prcNewWindow = reinterpret_cast<RECT *>(lParam);
-        SetWindowPos(hwnd, nullptr, prcNewWindow->left, prcNewWindow->top,
-                     prcNewWindow->right - prcNewWindow->left,
-                     prcNewWindow->bottom - prcNewWindow->top, SWP_NOZORDER | SWP_NOACTIVATE);
-        platformWindow->clearFlag(QWindowsWindow::WithinDpiChanged);
-        return true;
+        // Try to apply the suggested size first and then notify ScreenChanged
+        // so that the resize event sent from QGuiApplication incorporates it
+        // WM_DPICHANGED is sent with a size that avoids resize loops (by
+        // snapping back to the previous screen, see QTBUG-65580).
+        const bool doResize = resizeOnDpiChanged(platformWindow->window());
+        if (doResize) {
+            platformWindow->setFlag(QWindowsWindow::WithinDpiChanged);
+            platformWindow->updateFullFrameMargins();
+            const auto prcNewWindow = reinterpret_cast<RECT *>(lParam);
+            qCDebug(lcQpaWindows) << __FUNCTION__ << "WM_DPICHANGED"
+                << platformWindow->window() << *prcNewWindow;
+            SetWindowPos(hwnd, nullptr, prcNewWindow->left, prcNewWindow->top,
+                         prcNewWindow->right - prcNewWindow->left,
+                         prcNewWindow->bottom - prcNewWindow->top, SWP_NOZORDER | SWP_NOACTIVATE);
+            platformWindow->clearFlag(QWindowsWindow::WithinDpiChanged);
+        }
+        platformWindow->checkForScreenChanged(QWindowsWindow::FromDpiChange);
+        return doResize;
     }
 #if QT_CONFIG(sessionmanager)
     case QtWindows::QueryEndSessionApplicationEvent: {
@@ -1478,6 +1486,10 @@ void QWindowsContext::handleExitSizeMove(QWindow *window)
                                                      keyboardModifiers);
         }
     }
+    if (d->m_systemInfo & QWindowsContext::SI_SupportsPointer)
+        d->m_pointerHandler.clearEvents();
+    else
+        d->m_mouseHandler.clearEvents();
 }
 
 bool QWindowsContext::asyncExpose() const
@@ -1587,6 +1599,7 @@ extern "C" LRESULT QT_WIN_CALLBACK qWindowsWndProc(HWND hwnd, UINT message, WPAR
             marginsFromRects(ncCalcSizeFrame, rectFromNcCalcSize(message, wParam, lParam, 0));
         if (margins.left() >= 0) {
             if (platformWindow) {
+                qCDebug(lcQpaWindows) << __FUNCTION__ << "WM_NCCALCSIZE for" << hwnd << margins;
                 platformWindow->setFullFrameMargins(margins);
             } else {
                 const QSharedPointer<QWindowCreationContext> ctx = QWindowsContext::instance()->windowCreationContext();
diff --git a/src/plugins/platforms/windows/qwindowscontext.h b/src/plugins/platforms/windows/qwindowscontext.h
index fd6c72668c..d94ae3f73b 100644
--- a/src/plugins/platforms/windows/qwindowscontext.h
+++ b/src/plugins/platforms/windows/qwindowscontext.h
@@ -102,6 +102,7 @@ struct QWindowsUser32DLL
     typedef BOOL (WINAPI *RemoveClipboardFormatListener)(HWND);
     typedef BOOL (WINAPI *GetDisplayAutoRotationPreferences)(DWORD *);
     typedef BOOL (WINAPI *SetDisplayAutoRotationPreferences)(DWORD);
+    typedef BOOL (WINAPI *AdjustWindowRectExForDpi)(LPRECT,DWORD,BOOL,DWORD,UINT);
     typedef BOOL (WINAPI *EnableNonClientDpiScaling)(HWND);
     typedef int  (WINAPI *GetWindowDpiAwarenessContext)(HWND);
     typedef int  (WINAPI *GetAwarenessFromDpiAwarenessContext)(int);
@@ -131,6 +132,7 @@ struct QWindowsUser32DLL
     GetDisplayAutoRotationPreferences getDisplayAutoRotationPreferences = nullptr;
     SetDisplayAutoRotationPreferences setDisplayAutoRotationPreferences = nullptr;
 
+    AdjustWindowRectExForDpi adjustWindowRectExForDpi = nullptr;
     EnableNonClientDpiScaling enableNonClientDpiScaling = nullptr;
     GetWindowDpiAwarenessContext getWindowDpiAwarenessContext = nullptr;
     GetAwarenessFromDpiAwarenessContext getAwarenessFromDpiAwarenessContext = nullptr;
@@ -153,7 +155,7 @@ struct QWindowsShcoreDLL {
 
 class QWindowsContext
 {
-    Q_DISABLE_COPY(QWindowsContext)
+    Q_DISABLE_COPY_MOVE(QWindowsContext)
 public:
 
     enum SystemInfoFlags
@@ -178,11 +180,11 @@ public:
 
     QString registerWindowClass(const QWindow *w);
     QString registerWindowClass(QString cname, WNDPROC proc,
-                                unsigned style = 0, HBRUSH brush = 0,
+                                unsigned style = 0, HBRUSH brush = nullptr,
                                 bool icon = false);
     HWND createDummyWindow(const QString &classNameIn,
                            const wchar_t *windowName,
-                           WNDPROC wndProc = 0, DWORD style = WS_OVERLAPPED);
+                           WNDPROC wndProc = nullptr, DWORD style = WS_OVERLAPPED);
 
     HDC displayContext() const;
     int screenDepth() const;
@@ -201,6 +203,8 @@ public:
     QWindowsWindow *findPlatformWindowAt(HWND parent, const QPoint &screenPoint,
                                              unsigned cwex_flags) const;
 
+    static bool shouldHaveNonClientDpiScaling(const QWindow *window);
+
     QWindow *windowUnderMouse() const;
     void clearWindowUnderMouse();
 
diff --git a/src/plugins/platforms/windows/qwindowscursor.h b/src/plugins/platforms/windows/qwindowscursor.h
index 2e57c80def..d5c189b5ca 100644
--- a/src/plugins/platforms/windows/qwindowscursor.h
+++ b/src/plugins/platforms/windows/qwindowscursor.h
@@ -68,7 +68,7 @@ inline uint qHash(const QWindowsPixmapCursorCacheKey &k, uint seed) noexcept
 
 class CursorHandle
 {
-    Q_DISABLE_COPY(CursorHandle)
+    Q_DISABLE_COPY_MOVE(CursorHandle)
 public:
     explicit CursorHandle(HCURSOR hcursor = nullptr) : m_hcursor(hcursor) {}
     ~CursorHandle()
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index e0bd38c951..e55b8fd7b8 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -507,7 +507,7 @@ class QWindowsNativeFileDialogBase;
 
 class QWindowsNativeFileDialogEventHandler : public QWindowsComBase<IFileDialogEvents>
 {
-    Q_DISABLE_COPY(QWindowsNativeFileDialogEventHandler)
+    Q_DISABLE_COPY_MOVE(QWindowsNativeFileDialogEventHandler)
 public:
     static IFileDialogEvents *create(QWindowsNativeFileDialogBase *nativeFileDialog);
 
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.h b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
index 6099ea9ac6..f0a7ef5e90 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.h
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
@@ -64,7 +64,7 @@ namespace QWindowsDialogs
 template <class BaseClass>
 class QWindowsDialogHelperBase : public BaseClass
 {
-    Q_DISABLE_COPY(QWindowsDialogHelperBase)
+    Q_DISABLE_COPY_MOVE(QWindowsDialogHelperBase)
 public:
     typedef QSharedPointer<QWindowsNativeDialogBase> QWindowsNativeDialogBasePtr;
     ~QWindowsDialogHelperBase() { cleanupThread(); }
@@ -75,7 +75,7 @@ public:
               QWindow *parent) override;
     void hide() override;
 
-    virtual bool supportsNonModalDialog(const QWindow * /* parent */ = 0) const { return true; }
+    virtual bool supportsNonModalDialog(const QWindow * /* parent */ = nullptr) const { return true; }
 
 protected:
     QWindowsDialogHelperBase() = default;
@@ -91,7 +91,7 @@ private:
     void cleanupThread();
 
     QWindowsNativeDialogBasePtr m_nativeDialog;
-    HWND m_ownerWindow = 0;
+    HWND m_ownerWindow = nullptr;
     int m_timerId = 0;
     QThread *m_thread = nullptr;
 };
diff --git a/src/plugins/platforms/windows/qwindowseglcontext.h b/src/plugins/platforms/windows/qwindowseglcontext.h
index 8a1e1ddae8..d96e266159 100644
--- a/src/plugins/platforms/windows/qwindowseglcontext.h
+++ b/src/plugins/platforms/windows/qwindowseglcontext.h
@@ -109,7 +109,7 @@ private:
 
 class QWindowsEGLStaticContext : public QWindowsStaticOpenGLContext
 {
-    Q_DISABLE_COPY(QWindowsEGLStaticContext)
+    Q_DISABLE_COPY_MOVE(QWindowsEGLStaticContext)
 
 public:
     static QWindowsEGLStaticContext *create(QWindowsOpenGLTester::Renderers preferredType);
diff --git a/src/plugins/platforms/windows/qwindowsglcontext.cpp b/src/plugins/platforms/windows/qwindowsglcontext.cpp
index d534ce87cd..66dd32d05e 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsglcontext.cpp
@@ -916,7 +916,7 @@ void QWindowsOpenGLContextFormat::apply(QSurfaceFormat *format) const
 
 class QOpenGLTemporaryContext
 {
-    Q_DISABLE_COPY(QOpenGLTemporaryContext)
+    Q_DISABLE_COPY_MOVE(QOpenGLTemporaryContext)
 public:
     QOpenGLTemporaryContext();
     ~QOpenGLTemporaryContext();
diff --git a/src/plugins/platforms/windows/qwindowsglcontext.h b/src/plugins/platforms/windows/qwindowsglcontext.h
index 199f8112e3..1abe2eb390 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.h
+++ b/src/plugins/platforms/windows/qwindowsglcontext.h
@@ -75,9 +75,9 @@ struct QOpenGLContextData
     QOpenGLContextData(HGLRC r, HWND h, HDC d) : renderingContext(r), hwnd(h), hdc(d) {}
     QOpenGLContextData() {}
 
-    HGLRC renderingContext = 0;
-    HWND hwnd = 0;
-    HDC hdc = 0;
+    HGLRC renderingContext = nullptr;
+    HWND hwnd = nullptr;
+    HDC hdc = nullptr;
 };
 
 class QOpenGLStaticContext;
@@ -89,7 +89,7 @@ struct QWindowsOpenGLContextFormat
 
     QSurfaceFormat::OpenGLContextProfile profile = QSurfaceFormat::NoProfile;
     int version = 0; //! majorVersion<<8 + minorVersion
-    QSurfaceFormat::FormatOptions options = 0;
+    QSurfaceFormat::FormatOptions options = nullptr;
 };
 
 #ifndef QT_NO_DEBUG_STREAM
@@ -134,7 +134,7 @@ private:
 
 class QOpenGLStaticContext : public QWindowsStaticOpenGLContext
 {
-    Q_DISABLE_COPY(QOpenGLStaticContext)
+    Q_DISABLE_COPY_MOVE(QOpenGLStaticContext)
     QOpenGLStaticContext();
 public:
     enum Extensions
@@ -222,7 +222,7 @@ private:
     typedef GLenum (APIENTRY *GlGetGraphicsResetStatusArbType)();
 
     inline void releaseDCs();
-    bool updateObtainedParams(HDC hdc, int *obtainedSwapInterval = 0);
+    bool updateObtainedParams(HDC hdc, int *obtainedSwapInterval = nullptr);
 
     QOpenGLStaticContext *m_staticContext;
     QOpenGLContext *m_context;
diff --git a/src/plugins/platforms/windows/qwindowsinputcontext.h b/src/plugins/platforms/windows/qwindowsinputcontext.h
index a47585c29e..857706bcb9 100644
--- a/src/plugins/platforms/windows/qwindowsinputcontext.h
+++ b/src/plugins/platforms/windows/qwindowsinputcontext.h
@@ -53,12 +53,12 @@ class QWindowsWindow;
 
 class QWindowsInputContext : public QPlatformInputContext
 {
-    Q_DISABLE_COPY(QWindowsInputContext)
+    Q_DISABLE_COPY_MOVE(QWindowsInputContext)
     Q_OBJECT
 
     struct CompositionContext
     {
-        HWND hwnd = 0;
+        HWND hwnd = nullptr;
         QString composition;
         int position = 0;
         bool isComposing = false;
diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index e896f9f0ee..f0754e3e57 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -133,7 +133,7 @@ QT_BEGIN_NAMESPACE
 
 struct QWindowsIntegrationPrivate
 {
-    Q_DISABLE_COPY(QWindowsIntegrationPrivate)
+    Q_DISABLE_COPY_MOVE(QWindowsIntegrationPrivate)
     explicit QWindowsIntegrationPrivate(const QStringList &paramList);
     ~QWindowsIntegrationPrivate();
 
@@ -217,6 +217,8 @@ static inline unsigned parseOptions(const QStringList &paramList,
             options |= QWindowsIntegration::NoNativeMenus;
         } else if (param == QLatin1String("nowmpointer")) {
             options |= QWindowsIntegration::DontUseWMPointer;
+        } else if (param == QLatin1String("reverse")) {
+            options |= QWindowsIntegration::RtlEnabled;
         } else {
             qWarning() << "Unknown option" << param;
         }
@@ -353,6 +355,9 @@ QPlatformWindow *QWindowsIntegration::createPlatformWindow(QWindow *window) cons
     QWindowsWindow *result = createPlatformWindowHelper(window, obtained);
     Q_ASSERT(result);
 
+    if (window->isTopLevel() && !QWindowsContext::shouldHaveNonClientDpiScaling(window))
+        result->setFlag(QWindowsWindow::DisableNonClientScaling);
+
     if (QWindowsMenuBar *menuBarToBeInstalled = QWindowsMenuBar::menuBarOf(window))
         menuBarToBeInstalled->install(result);
 
diff --git a/src/plugins/platforms/windows/qwindowsintegration.h b/src/plugins/platforms/windows/qwindowsintegration.h
index e28b2c2fb3..b49d21022b 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.h
+++ b/src/plugins/platforms/windows/qwindowsintegration.h
@@ -54,7 +54,7 @@ class QWindowsStaticOpenGLContext;
 
 class QWindowsIntegration : public QPlatformIntegration
 {
-    Q_DISABLE_COPY(QWindowsIntegration)
+    Q_DISABLE_COPY_MOVE(QWindowsIntegration)
 public:
     enum Options { // Options to be passed on command line.
         FontDatabaseFreeType = 0x1,
@@ -69,7 +69,8 @@ public:
         AlwaysUseNativeMenus = 0x100,
         NoNativeMenus = 0x200,
         DontUseWMPointer = 0x400,
-        DetectAltGrModifier = 0x800
+        DetectAltGrModifier = 0x800,
+        RtlEnabled = 0x1000
     };
 
     explicit QWindowsIntegration(const QStringList &paramList);
diff --git a/src/plugins/platforms/windows/qwindowskeymapper.h b/src/plugins/platforms/windows/qwindowskeymapper.h
index a454f0f973..b1ada1d373 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.h
+++ b/src/plugins/platforms/windows/qwindowskeymapper.h
@@ -71,7 +71,7 @@ struct KeyboardLayoutItem {
 
 class QWindowsKeyMapper
 {
-    Q_DISABLE_COPY(QWindowsKeyMapper)
+    Q_DISABLE_COPY_MOVE(QWindowsKeyMapper)
 public:
     explicit QWindowsKeyMapper();
     ~QWindowsKeyMapper();
diff --git a/src/plugins/platforms/windows/qwindowsmime.h b/src/plugins/platforms/windows/qwindowsmime.h
index 6bbbae1a0e..1c389e8800 100644
--- a/src/plugins/platforms/windows/qwindowsmime.h
+++ b/src/plugins/platforms/windows/qwindowsmime.h
@@ -53,7 +53,7 @@ class QMimeData;
 
 class QWindowsMime
 {
-    Q_DISABLE_COPY(QWindowsMime)
+    Q_DISABLE_COPY_MOVE(QWindowsMime)
 public:
     QWindowsMime();
     virtual ~QWindowsMime();
@@ -73,7 +73,7 @@ public:
 
 class QWindowsMimeConverter
 {
-    Q_DISABLE_COPY(QWindowsMimeConverter)
+    Q_DISABLE_COPY_MOVE(QWindowsMimeConverter)
 public:
     QWindowsMimeConverter();
     ~QWindowsMimeConverter();
@@ -85,7 +85,7 @@ public:
 
     // Convenience.
     QVariant convertToMime(const QStringList &mimeTypes, IDataObject *pDataObj, QVariant::Type preferredType,
-                           QString *format = 0) const;
+                           QString *format = nullptr) const;
 
     void registerMime(QWindowsMime *mime);
     void unregisterMime(QWindowsMime *mime) { m_mimes.removeOne(mime); }
diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index c4d53855a5..97e1319e8d 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -106,7 +106,7 @@ static inline void compressMouseMove(MSG *msg)
                 // Extract the x,y coordinates from the lParam as we do in the WndProc
                 msg->pt.x = GET_X_LPARAM(mouseMsg.lParam);
                 msg->pt.y = GET_Y_LPARAM(mouseMsg.lParam);
-                ClientToScreen(msg->hwnd, &(msg->pt));
+                clientToScreen(msg->hwnd, &(msg->pt));
                 // Remove the mouse move message
                 PeekMessage(&mouseMsg, msg->hwnd, WM_MOUSEMOVE,
                             WM_MOUSEMOVE, PM_REMOVE);
@@ -157,6 +157,12 @@ QTouchDevice *QWindowsMouseHandler::ensureTouchDevice()
     return m_touchDevice;
 }
 
+void QWindowsMouseHandler::clearEvents()
+{
+    m_lastEventType = QEvent::None;
+    m_lastEventButton = Qt::NoButton;
+}
+
 Qt::MouseButtons QWindowsMouseHandler::queryMouseButtons()
 {
     Qt::MouseButtons result = nullptr;
@@ -262,7 +268,13 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
     if (et == QtWindows::MouseWheelEvent)
         return translateMouseWheelEvent(window, hwnd, msg, result);
 
-    const QPoint winEventPosition(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    QPoint winEventPosition(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    if ((et & QtWindows::NonClientEventFlag) == 0 && QWindowsBaseWindow::isRtlLayout(hwnd))  {
+        RECT clientArea;
+        GetClientRect(hwnd, &clientArea);
+        winEventPosition.setX(clientArea.right - winEventPosition.x());
+    }
+
     QPoint clientPosition;
     QPoint globalPosition;
     if (et & QtWindows::NonClientEventFlag) {
@@ -287,8 +299,6 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
 
     Qt::MouseEventSource source = Qt::MouseEventNotSynthesized;
 
-    const MouseEvent mouseEvent = eventFromMsg(msg);
-
     // Check for events synthesized from touch. Lower byte is touch index, 0 means pen.
     static const bool passSynthesizedMouseEvents =
             !(QWindowsIntegration::instance()->options() & QWindowsIntegration::DontPassOsMouseEventsSynthesizedFromTouch);
@@ -305,13 +315,40 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
         }
     }
 
+    const Qt::KeyboardModifiers keyModifiers = QWindowsKeyMapper::queryKeyboardModifiers();
+    const MouseEvent mouseEvent = eventFromMsg(msg);
+    Qt::MouseButtons buttons;
+
+    if (mouseEvent.type >= QEvent::NonClientAreaMouseMove && mouseEvent.type <= QEvent::NonClientAreaMouseButtonDblClick)
+        buttons = queryMouseButtons();
+    else
+        buttons = keyStateToMouseButtons(msg.wParam);
+
+    // When the left/right mouse buttons are pressed over the window title bar
+    // WM_NCLBUTTONDOWN/WM_NCRBUTTONDOWN messages are received. But no UP
+    // messages are received on release, only WM_NCMOUSEMOVE/WM_MOUSEMOVE.
+    // We detect it and generate the missing release events here. (QTBUG-75678)
+    // The last event vars are cleared on QWindowsContext::handleExitSizeMove()
+    // to avoid generating duplicated release events.
+    if (m_lastEventType == QEvent::NonClientAreaMouseButtonPress
+            && (mouseEvent.type == QEvent::NonClientAreaMouseMove || mouseEvent.type == QEvent::MouseMove)
+            && (m_lastEventButton & buttons) == 0) {
+            if (mouseEvent.type == QEvent::NonClientAreaMouseMove) {
+                QWindowSystemInterface::handleFrameStrutMouseEvent(window, clientPosition, globalPosition, buttons, m_lastEventButton,
+                                                                   QEvent::NonClientAreaMouseButtonRelease, keyModifiers, source);
+            } else {
+                QWindowSystemInterface::handleMouseEvent(window, clientPosition, globalPosition, buttons, m_lastEventButton,
+                                                         QEvent::MouseButtonRelease, keyModifiers, source);
+            }
+    }
+    m_lastEventType = mouseEvent.type;
+    m_lastEventButton = mouseEvent.button;
+
     if (mouseEvent.type >= QEvent::NonClientAreaMouseMove && mouseEvent.type <= QEvent::NonClientAreaMouseButtonDblClick) {
-        const Qt::MouseButtons buttons = QWindowsMouseHandler::queryMouseButtons();
         QWindowSystemInterface::handleFrameStrutMouseEvent(window, clientPosition,
                                                            globalPosition, buttons,
                                                            mouseEvent.button, mouseEvent.type,
-                                                           QWindowsKeyMapper::queryKeyboardModifiers(),
-                                                           source);
+                                                           keyModifiers, source);
         return false; // Allow further event processing (dragging of windows).
     }
 
@@ -334,7 +371,6 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
     }
 
     QWindowsWindow *platformWindow = static_cast<QWindowsWindow *>(window->handle());
-    const Qt::MouseButtons buttons = keyStateToMouseButtons(int(msg.wParam));
 
     // If the window was recently resized via mouse doubleclick on the frame or title bar,
     // we don't get WM_LBUTTONDOWN or WM_LBUTTONDBLCLK for the second click,
@@ -461,8 +497,7 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
     if (!discardEvent && mouseEvent.type != QEvent::None) {
         QWindowSystemInterface::handleMouseEvent(window, winEventPosition, globalPosition, buttons,
                                                  mouseEvent.button, mouseEvent.type,
-                                                 QWindowsKeyMapper::queryKeyboardModifiers(),
-                                                 source);
+                                                 keyModifiers, source);
     }
     m_previousCaptureWindow = hasCapture ? window : nullptr;
     // QTBUG-48117, force synchronous handling for the extra buttons so that WM_APPCOMMAND
diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.h b/src/plugins/platforms/windows/qwindowsmousehandler.h
index 480662c9bf..1d3d1f4761 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.h
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.h
@@ -45,6 +45,7 @@
 
 #include <QtCore/qpointer.h>
 #include <QtCore/qhash.h>
+#include <QtGui/qevent.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -53,7 +54,7 @@ class QTouchDevice;
 
 class QWindowsMouseHandler
 {
-    Q_DISABLE_COPY(QWindowsMouseHandler)
+    Q_DISABLE_COPY_MOVE(QWindowsMouseHandler)
 public:
     QWindowsMouseHandler();
 
@@ -72,13 +73,14 @@ public:
     bool translateScrollEvent(QWindow *window, HWND hwnd,
                               MSG msg, LRESULT *result);
 
-    static inline Qt::MouseButtons keyStateToMouseButtons(int);
+    static inline Qt::MouseButtons keyStateToMouseButtons(WPARAM);
     static inline Qt::KeyboardModifiers keyStateToModifiers(int);
     static inline int mouseButtonsToKeyState(Qt::MouseButtons);
 
     static Qt::MouseButtons queryMouseButtons();
     QWindow *windowUnderMouse() const { return m_windowUnderMouse.data(); }
-    void clearWindowUnderMouse() { m_windowUnderMouse = 0; }
+    void clearWindowUnderMouse() { m_windowUnderMouse = nullptr; }
+    void clearEvents();
 
 private:
     inline bool translateMouseWheelEvent(QWindow *window, HWND hwnd,
@@ -91,9 +93,11 @@ private:
     QTouchDevice *m_touchDevice = nullptr;
     bool m_leftButtonDown = false;
     QWindow *m_previousCaptureWindow = nullptr;
+    QEvent::Type m_lastEventType = QEvent::None;
+    Qt::MouseButton m_lastEventButton = Qt::NoButton;
 };
 
-Qt::MouseButtons QWindowsMouseHandler::keyStateToMouseButtons(int wParam)
+Qt::MouseButtons QWindowsMouseHandler::keyStateToMouseButtons(WPARAM wParam)
 {
     Qt::MouseButtons mb(Qt::NoButton);
     if (wParam & MK_LBUTTON)
diff --git a/src/plugins/platforms/windows/qwindowsopenglcontext.h b/src/plugins/platforms/windows/qwindowsopenglcontext.h
index cc6d93d35e..1416a7e575 100644
--- a/src/plugins/platforms/windows/qwindowsopenglcontext.h
+++ b/src/plugins/platforms/windows/qwindowsopenglcontext.h
@@ -51,7 +51,7 @@ class QWindowsOpenGLContext;
 
 class QWindowsStaticOpenGLContext
 {
-    Q_DISABLE_COPY(QWindowsStaticOpenGLContext)
+    Q_DISABLE_COPY_MOVE(QWindowsStaticOpenGLContext)
 public:
     static QWindowsStaticOpenGLContext *create();
     virtual ~QWindowsStaticOpenGLContext() = default;
@@ -63,7 +63,7 @@ public:
 
     // If the windowing system interface needs explicitly created window surfaces (like EGL),
     // reimplement these.
-    virtual void *createWindowSurface(void * /*nativeWindow*/, void * /*nativeConfig*/, int * /*err*/) { return 0; }
+    virtual void *createWindowSurface(void * /*nativeWindow*/, void * /*nativeConfig*/, int * /*err*/) { return nullptr; }
     virtual void destroyWindowSurface(void * /*nativeSurface*/) { }
 
 protected:
@@ -75,14 +75,14 @@ private:
 
 class QWindowsOpenGLContext : public QPlatformOpenGLContext
 {
-    Q_DISABLE_COPY(QWindowsOpenGLContext)
+    Q_DISABLE_COPY_MOVE(QWindowsOpenGLContext)
 public:
     // Returns the native context handle (e.g. HGLRC for WGL, EGLContext for EGL).
     virtual void *nativeContext() const = 0;
 
     // These should be implemented only for some winsys interfaces, for example EGL.
     // For others, like WGL, they are not relevant.
-    virtual void *nativeDisplay() const { return 0; }
+    virtual void *nativeDisplay() const { return nullptr; }
     virtual void *nativeConfig() const { return 0; }
 
 protected:
diff --git a/src/plugins/platforms/windows/qwindowsopengltester.cpp b/src/plugins/platforms/windows/qwindowsopengltester.cpp
index 35418a18e7..ff495c8290 100644
--- a/src/plugins/platforms/windows/qwindowsopengltester.cpp
+++ b/src/plugins/platforms/windows/qwindowsopengltester.cpp
@@ -83,7 +83,7 @@ static GpuDescription adapterIdentifierToGpuDescription(const D3DADAPTER_IDENTIF
 class QDirect3D9Handle
 {
 public:
-    Q_DISABLE_COPY(QDirect3D9Handle)
+    Q_DISABLE_COPY_MOVE(QDirect3D9Handle)
 
     QDirect3D9Handle();
     ~QDirect3D9Handle();
diff --git a/src/plugins/platforms/windows/qwindowspointerhandler.cpp b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
index 7da87a32d5..36c614af34 100644
--- a/src/plugins/platforms/windows/qwindowspointerhandler.cpp
+++ b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
@@ -336,6 +336,12 @@ QTouchDevice *QWindowsPointerHandler::ensureTouchDevice()
     return m_touchDevice;
 }
 
+void QWindowsPointerHandler::clearEvents()
+{
+    m_lastEventType = QEvent::None;
+    m_lastEventButton = Qt::NoButton;
+}
+
 void QWindowsPointerHandler::handleCaptureRelease(QWindow *window,
                                                   QWindow *currentWindowUnderPointer,
                                                   HWND hwnd,
@@ -474,7 +480,7 @@ bool QWindowsPointerHandler::translateTouchEvent(QWindow *window, HWND hwnd,
                 << " message=" << Qt::hex << msg.message
                 << " count=" << Qt::dec << count;
 
-    Qt::TouchPointStates allStates = 0;
+    Qt::TouchPointStates allStates = nullptr;
 
     for (quint32 i = 0; i < count; ++i) {
         if (QWindowsContext::verbose > 1)
@@ -614,6 +620,9 @@ bool QWindowsPointerHandler::translatePenEvent(QWindow *window, HWND hwnd, QtWin
         if (m_needsEnterOnPointerUpdate) {
             m_needsEnterOnPointerUpdate = false;
             if (window != m_currentWindow) {
+                // make sure we subscribe to leave events for this window
+                trackLeave(hwnd);
+
                 QWindowSystemInterface::handleEnterEvent(window, localPos, globalPos);
                 m_currentWindow = window;
                 if (QWindowsWindow *wumPlatformWindow = QWindowsWindow::windowsWindowOf(target))
@@ -685,7 +694,13 @@ bool QWindowsPointerHandler::translateMouseEvent(QWindow *window,
 {
     *result = 0;
 
-    const QPoint eventPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    QPoint eventPos(GET_X_LPARAM(msg.lParam), GET_Y_LPARAM(msg.lParam));
+    if ((et & QtWindows::NonClientEventFlag) == 0 && QWindowsBaseWindow::isRtlLayout(hwnd))  {
+        RECT clientArea;
+        GetClientRect(hwnd, &clientArea);
+        eventPos.setX(clientArea.right - eventPos.x());
+    }
+
     QPoint localPos;
     QPoint globalPos;
 
@@ -723,10 +738,35 @@ bool QWindowsPointerHandler::translateMouseEvent(QWindow *window,
     }
 
     const MouseEvent mouseEvent = eventFromMsg(msg);
+    Qt::MouseButtons mouseButtons;
+
+    if (mouseEvent.type >= QEvent::NonClientAreaMouseMove && mouseEvent.type <= QEvent::NonClientAreaMouseButtonDblClick)
+        mouseButtons = queryMouseButtons();
+    else
+        mouseButtons = mouseButtonsFromKeyState(msg.wParam);
+
+    // When the left/right mouse buttons are pressed over the window title bar
+    // WM_NCLBUTTONDOWN/WM_NCRBUTTONDOWN messages are received. But no UP
+    // messages are received on release, only WM_NCMOUSEMOVE/WM_MOUSEMOVE.
+    // We detect it and generate the missing release events here. (QTBUG-75678)
+    // The last event vars are cleared on QWindowsContext::handleExitSizeMove()
+    // to avoid generating duplicated release events.
+    if (m_lastEventType == QEvent::NonClientAreaMouseButtonPress
+            && (mouseEvent.type == QEvent::NonClientAreaMouseMove || mouseEvent.type == QEvent::MouseMove)
+            && (m_lastEventButton & mouseButtons) == 0) {
+            if (mouseEvent.type == QEvent::NonClientAreaMouseMove) {
+                QWindowSystemInterface::handleFrameStrutMouseEvent(window, localPos, globalPos, mouseButtons, m_lastEventButton,
+                                                                   QEvent::NonClientAreaMouseButtonRelease, keyModifiers, source);
+            } else {
+                QWindowSystemInterface::handleMouseEvent(window, localPos, globalPos, mouseButtons, m_lastEventButton,
+                                                         QEvent::MouseButtonRelease, keyModifiers, source);
+            }
+    }
+    m_lastEventType = mouseEvent.type;
+    m_lastEventButton = mouseEvent.button;
 
     if (mouseEvent.type >= QEvent::NonClientAreaMouseMove && mouseEvent.type <= QEvent::NonClientAreaMouseButtonDblClick) {
-        const Qt::MouseButtons nonclientButtons = queryMouseButtons();
-        QWindowSystemInterface::handleFrameStrutMouseEvent(window, localPos, globalPos, nonclientButtons,
+        QWindowSystemInterface::handleFrameStrutMouseEvent(window, localPos, globalPos, mouseButtons,
                                                            mouseEvent.button, mouseEvent.type, keyModifiers, source);
         return false; // Allow further event processing
     }
@@ -742,8 +782,6 @@ bool QWindowsPointerHandler::translateMouseEvent(QWindow *window,
         return true;
     }
 
-    const Qt::MouseButtons mouseButtons = mouseButtonsFromKeyState(msg.wParam);
-
     handleCaptureRelease(window, currentWindowUnderPointer, hwnd, mouseEvent.type, mouseButtons);
     handleEnterLeave(window, currentWindowUnderPointer, globalPos);
 
diff --git a/src/plugins/platforms/windows/qwindowspointerhandler.h b/src/plugins/platforms/windows/qwindowspointerhandler.h
index aebef062bc..068e804007 100644
--- a/src/plugins/platforms/windows/qwindowspointerhandler.h
+++ b/src/plugins/platforms/windows/qwindowspointerhandler.h
@@ -46,7 +46,7 @@
 #include <QtCore/qpointer.h>
 #include <QtCore/qscopedpointer.h>
 #include <QtCore/qhash.h>
-#include <qpa/qwindowsysteminterface.h>
+#include <QtGui/qevent.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -55,7 +55,7 @@ class QTouchDevice;
 
 class QWindowsPointerHandler
 {
-    Q_DISABLE_COPY(QWindowsPointerHandler)
+    Q_DISABLE_COPY_MOVE(QWindowsPointerHandler)
 public:
     QWindowsPointerHandler() = default;
     bool translatePointerEvent(QWindow *window, HWND hwnd, QtWindows::WindowsEventType et, MSG msg, LRESULT *result);
@@ -64,6 +64,7 @@ public:
     QTouchDevice *ensureTouchDevice();
     QWindow *windowUnderMouse() const { return m_windowUnderPointer.data(); }
     void clearWindowUnderMouse() { m_windowUnderPointer = nullptr; }
+    void clearEvents();
 
 private:
     bool translateTouchEvent(QWindow *window, HWND hwnd, QtWindows::WindowsEventType et, MSG msg, PVOID vTouchInfo, unsigned int count);
@@ -79,6 +80,8 @@ private:
     QPointer<QWindow> m_currentWindow;
     QWindow *m_previousCaptureWindow = nullptr;
     bool m_needsEnterOnPointerUpdate = false;
+    QEvent::Type m_lastEventType = QEvent::None;
+    Qt::MouseButton m_lastEventButton = Qt::NoButton;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowsscreen.cpp b/src/plugins/platforms/windows/qwindowsscreen.cpp
index b70b0bbe31..2f8850cbe0 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.cpp
+++ b/src/plugins/platforms/windows/qwindowsscreen.cpp
@@ -240,7 +240,8 @@ QWindow *QWindowsScreen::topLevelAt(const QPoint &point) const
     QWindow *result = nullptr;
     if (QWindow *child = QWindowsScreen::windowAt(point, CWP_SKIPINVISIBLE))
         result = QWindowsWindow::topLevelOf(child);
-    qCDebug(lcQpaWindows) <<__FUNCTION__ << point << result;
+    if (QWindowsContext::verbose > 1)
+        qCDebug(lcQpaWindows) <<__FUNCTION__ << point << result;
     return result;
 }
 
@@ -250,7 +251,8 @@ QWindow *QWindowsScreen::windowAt(const QPoint &screenPoint, unsigned flags)
     if (QPlatformWindow *bw = QWindowsContext::instance()->
             findPlatformWindowAt(GetDesktopWindow(), screenPoint, flags))
         result = bw->window();
-    qCDebug(lcQpaWindows) <<__FUNCTION__ << screenPoint << " returns " << result;
+    if (QWindowsContext::verbose > 1)
+        qCDebug(lcQpaWindows) <<__FUNCTION__ << screenPoint << " returns " << result;
     return result;
 }
 
@@ -438,6 +440,12 @@ QPlatformScreen::SubpixelAntialiasingType QWindowsScreen::subpixelAntialiasingTy
 
 QWindowsScreenManager::QWindowsScreenManager() = default;
 
+
+bool QWindowsScreenManager::isSingleScreen()
+{
+    return QWindowsContext::instance()->screenManager().screens().size() < 2;
+}
+
 /*!
     \brief Triggers synchronization of screens (WM_DISPLAYCHANGE).
 
diff --git a/src/plugins/platforms/windows/qwindowsscreen.h b/src/plugins/platforms/windows/qwindowsscreen.h
index 33c9effa2a..3eb2d35b27 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.h
+++ b/src/plugins/platforms/windows/qwindowsscreen.h
@@ -140,6 +140,8 @@ public:
     const QWindowsScreen *screenAtDp(const QPoint &p) const;
     const QWindowsScreen *screenForHwnd(HWND hwnd) const;
 
+    static bool isSingleScreen();
+
 private:
     void removeScreen(int index);
 
diff --git a/src/plugins/platforms/windows/qwindowssessionmanager.h b/src/plugins/platforms/windows/qwindowssessionmanager.h
index 4c4256f2b0..0769ed1fce 100644
--- a/src/plugins/platforms/windows/qwindowssessionmanager.h
+++ b/src/plugins/platforms/windows/qwindowssessionmanager.h
@@ -79,7 +79,7 @@ private:
     bool m_blockUserInput = false;
     bool m_canceled = false;
 
-    Q_DISABLE_COPY(QWindowsSessionManager)
+    Q_DISABLE_COPY_MOVE(QWindowsSessionManager)
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowstabletsupport.cpp b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
index 84c963af94..cd5a78abb6 100644
--- a/src/plugins/platforms/windows/qwindowstabletsupport.cpp
+++ b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
@@ -435,6 +435,27 @@ bool QWindowsTabletSupport::translateTabletProximityEvent(WPARAM /* wParam */, L
         m_currentDevice = m_devices.size();
         m_devices.push_back(tabletInit(uniqueId, cursorType));
     }
+
+    /**
+     * We should check button map for changes on every proximity event, not
+     * only during initialization phase.
+     *
+     * WARNING: in 2016 there were some Wacom table drivers, which could mess up
+     *          button mapping if the remapped button was pressed, while the
+     *          application **didn't have input focus**. This bug is somehow
+     *          related to the fact that Wacom drivers allow user to configure
+     *          per-application button-mappings. If the bug shows up again,
+     *          just move this button-map fetching into initialization block.
+     *
+     *          See https://bugs.kde.org/show_bug.cgi?id=359561
+     */
+    BYTE logicalButtons[32];
+    memset(logicalButtons, 0, 32);
+    m_winTab32DLL.wTInfo(WTI_CURSORS + currentCursor, CSR_SYSBTNMAP, &logicalButtons);
+    m_devices[m_currentDevice].buttonsMap[0x1] = logicalButtons[0];
+    m_devices[m_currentDevice].buttonsMap[0x2] = logicalButtons[1];
+    m_devices[m_currentDevice].buttonsMap[0x4] = logicalButtons[2];
+
     m_devices[m_currentDevice].currentPointerType = pointerType(currentCursor);
     m_state = PenProximity;
     qCDebug(lcQpaTablet) << "enter proximity for device #"
@@ -446,6 +467,52 @@ bool QWindowsTabletSupport::translateTabletProximityEvent(WPARAM /* wParam */, L
     return true;
 }
 
+Qt::MouseButton buttonValueToEnum(DWORD button,
+                                  const QWindowsTabletDeviceData &tdd) {
+
+    enum : unsigned {
+        leftButtonValue = 0x1,
+        middleButtonValue = 0x2,
+        rightButtonValue = 0x4,
+        doubleClickButtonValue = 0x7
+    };
+
+    button = tdd.buttonsMap.value(button);
+
+    return button == leftButtonValue ? Qt::LeftButton :
+        button == rightButtonValue ? Qt::RightButton :
+        button == doubleClickButtonValue ? Qt::MiddleButton :
+        button == middleButtonValue ? Qt::MiddleButton :
+        button ? Qt::LeftButton /* fallback item */ :
+        Qt::NoButton;
+}
+
+Qt::MouseButtons convertTabletButtons(DWORD btnNew,
+                                      const QWindowsTabletDeviceData &tdd) {
+
+    Qt::MouseButtons buttons = Qt::NoButton;
+    for (unsigned int i = 0; i < 3; i++) {
+        unsigned int btn = 0x1 << i;
+
+        if (btn & btnNew) {
+            Qt::MouseButton convertedButton =
+                buttonValueToEnum(btn, tdd);
+
+            buttons |= convertedButton;
+
+            /**
+             * If a button that is present in hardware input is
+             * mapped to a Qt::NoButton, it means that it is going
+             * to be eaten by the driver, for example by its
+             * "Pan/Scroll" feature. Therefore we shouldn't handle
+             * any of the events associated to it. We'll just return
+             * Qt::NoButtons here.
+             */
+        }
+    }
+    return buttons;
+}
+
 bool QWindowsTabletSupport::translateTabletPacketEvent()
 {
     static PACKET localPacketBuf[TabletPacketQSize];  // our own tablet packet queue.
@@ -552,9 +619,12 @@ bool QWindowsTabletSupport::translateTabletPacketEvent()
                 << tiltY << "tanP:" << tangentialPressure << "rotation:" << rotation;
         }
 
+        Qt::MouseButtons buttons =
+            convertTabletButtons(packet.pkButtons, m_devices.at(m_currentDevice));
+
         QWindowSystemInterface::handleTabletEvent(target, packet.pkTime, QPointF(localPos), globalPosF,
                                                   currentDevice, currentPointer,
-                                                  static_cast<Qt::MouseButtons>(packet.pkButtons),
+                                                  buttons,
                                                   pressureNew, tiltX, tiltY,
                                                   tangentialPressure, rotation, z,
                                                   uniqueId,
diff --git a/src/plugins/platforms/windows/qwindowstabletsupport.h b/src/plugins/platforms/windows/qwindowstabletsupport.h
index d91701d6a5..6bcf3357a5 100644
--- a/src/plugins/platforms/windows/qwindowstabletsupport.h
+++ b/src/plugins/platforms/windows/qwindowstabletsupport.h
@@ -45,6 +45,7 @@
 
 #include <QtCore/qvector.h>
 #include <QtCore/qpoint.h>
+#include <QtCore/qhash.h>
 
 #include <wintab.h>
 
@@ -100,6 +101,7 @@ struct QWindowsTabletDeviceData
     qint64 uniqueId = 0;
     int currentDevice = 0;
     int currentPointerType = 0;
+    QHash<quint8, quint8> buttonsMap;
 };
 
 #ifndef QT_NO_DEBUG_STREAM
@@ -108,7 +110,7 @@ QDebug operator<<(QDebug d, const QWindowsTabletDeviceData &t);
 
 class QWindowsTabletSupport
 {
-    Q_DISABLE_COPY(QWindowsTabletSupport)
+    Q_DISABLE_COPY_MOVE(QWindowsTabletSupport)
 
     explicit QWindowsTabletSupport(HWND window, HCTX context);
 
diff --git a/src/plugins/platforms/windows/qwindowstheme.cpp b/src/plugins/platforms/windows/qwindowstheme.cpp
index a6b9781252..b75c64c40e 100644
--- a/src/plugins/platforms/windows/qwindowstheme.cpp
+++ b/src/plugins/platforms/windows/qwindowstheme.cpp
@@ -170,15 +170,9 @@ public:
             if (m_params) {
                 const QString fileName = m_params->fileName;
                 SHFILEINFO info;
-#ifndef Q_OS_WINCE
-                const UINT oldErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
-#endif
                 const bool result = SHGetFileInfo(reinterpret_cast<const wchar_t *>(fileName.utf16()),
                                                   m_params->attributes, &info, sizeof(SHFILEINFO),
                                                   m_params->flags);
-#ifndef Q_OS_WINCE
-                SetErrorMode(oldErrorMode);
-#endif
                 m_doneMutex.lock();
                 if (!m_cancelled.load()) {
                     *m_params->result = result;
diff --git a/src/plugins/platforms/windows/qwindowstheme.h b/src/plugins/platforms/windows/qwindowstheme.h
index c132f20167..4e24308445 100644
--- a/src/plugins/platforms/windows/qwindowstheme.h
+++ b/src/plugins/platforms/windows/qwindowstheme.h
@@ -51,7 +51,7 @@ class QWindow;
 
 class QWindowsTheme : public QPlatformTheme
 {
-    Q_DISABLE_COPY(QWindowsTheme)
+    Q_DISABLE_COPY_MOVE(QWindowsTheme)
 public:
     QWindowsTheme();
     ~QWindowsTheme() override;
@@ -71,7 +71,7 @@ public:
 
     QPixmap standardPixmap(StandardPixmap sp, const QSizeF &size) const override;
 
-    QIcon fileIcon(const QFileInfo &fileInfo, QPlatformTheme::IconOptions iconOptions = 0) const override;
+    QIcon fileIcon(const QFileInfo &fileInfo, QPlatformTheme::IconOptions iconOptions = nullptr) const override;
 
     void windowsThemeChanged(QWindow *window);
     void displayChanged() { refreshIconPixmapSizes(); }
diff --git a/src/plugins/platforms/windows/qwindowsthreadpoolrunner.h b/src/plugins/platforms/windows/qwindowsthreadpoolrunner.h
index 731e4b5432..ffe2e62069 100644
--- a/src/plugins/platforms/windows/qwindowsthreadpoolrunner.h
+++ b/src/plugins/platforms/windows/qwindowsthreadpoolrunner.h
@@ -59,7 +59,7 @@ QT_BEGIN_NAMESPACE
 */
 class QWindowsThreadPoolRunner
 {
-    Q_DISABLE_COPY(QWindowsThreadPoolRunner)
+    Q_DISABLE_COPY_MOVE(QWindowsThreadPoolRunner)
 
 #if QT_CONFIG(thread)
     template <class RunnableFunction> // nested class implementing QRunnable to execute a function.
diff --git a/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp b/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp
index 7a01483abd..812ea8193a 100644
--- a/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp
+++ b/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp
@@ -81,7 +81,7 @@ bool QWindowsVulkanInstance::supportsPresent(VkPhysicalDevice physicalDevice,
 
 VkSurfaceKHR QWindowsVulkanInstance::createSurface(HWND win)
 {
-    VkSurfaceKHR surface = 0;
+    VkSurfaceKHR surface = VK_NULL_HANDLE;
 
     if (!m_createSurface) {
         m_createSurface = reinterpret_cast<PFN_vkCreateWin32SurfaceKHR>(
diff --git a/src/plugins/platforms/windows/qwindowsvulkaninstance.h b/src/plugins/platforms/windows/qwindowsvulkaninstance.h
index 3292137c39..cc7ef476d4 100644
--- a/src/plugins/platforms/windows/qwindowsvulkaninstance.h
+++ b/src/plugins/platforms/windows/qwindowsvulkaninstance.h
@@ -53,7 +53,7 @@ QT_BEGIN_NAMESPACE
 
 class QWindowsVulkanInstance : public QBasicPlatformVulkanInstance
 {
-    Q_DISABLE_COPY(QWindowsVulkanInstance)
+    Q_DISABLE_COPY_MOVE(QWindowsVulkanInstance)
 public:
     QWindowsVulkanInstance(QVulkanInstance *instance);
 
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index d55545af42..74c295d155 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -134,6 +134,10 @@ static QByteArray debugWinExStyle(DWORD exStyle)
         rc += " WS_EX_LAYERED";
     if (exStyle & WS_EX_DLGMODALFRAME)
         rc += " WS_EX_DLGMODALFRAME";
+    if (exStyle & WS_EX_LAYOUTRTL)
+        rc += " WS_EX_LAYOUTRTL";
+    if (exStyle & WS_EX_NOINHERITLAYOUT)
+        rc += " WS_EX_NOINHERITLAYOUT";
     return rc;
 }
 
@@ -184,6 +188,7 @@ static inline RECT RECTfromQRect(const QRect &rect)
     return result;
 }
 
+
 #ifndef QT_NO_DEBUG_STREAM
 QDebug operator<<(QDebug d, const RECT &r)
 {
@@ -262,6 +267,16 @@ QDebug operator<<(QDebug d, const GUID &guid)
 }
 #endif // !QT_NO_DEBUG_STREAM
 
+static void formatBriefRectangle(QDebug &d, const QRect &r)
+{
+    d << r.width() << 'x' << r.height() << Qt::forcesign << r.x() << r.y() << Qt::noforcesign;
+}
+
+static void formatBriefMargins(QDebug &d, const QMargins &m)
+{
+    d << m.left() << ", " << m.top() << ", " << m.right() << ", " << m.bottom();
+}
+
 // QTBUG-43872, for windows that do not have WS_EX_TOOLWINDOW set, WINDOWPLACEMENT
 // is in workspace/available area coordinates.
 static QPoint windowPlacementOffset(HWND hwnd, const QPoint &point)
@@ -296,7 +311,7 @@ static inline QRect frameGeometry(HWND hwnd, bool topLevel)
         const int width = rect.right - rect.left;
         const int height = rect.bottom - rect.top;
         POINT leftTop = { rect.left, rect.top };
-        ScreenToClient(parent, &leftTop);
+        screenToClient(parent, &leftTop);
         rect.left = leftTop.x;
         rect.top = leftTop.y;
         rect.right = leftTop.x + width;
@@ -656,6 +671,17 @@ void WindowCreationData::fromWindow(const QWindow *w, const Qt::WindowFlags flag
     if ((flags & Qt::MSWindowsFixedSizeDialogHint))
         dialog = true;
 
+    // This causes the title bar to drawn RTL and the close button
+    // to be left. Note that this causes:
+    // - All DCs created on the Window to have RTL layout (see SetLayout)
+    // - ClientToScreen() and ScreenToClient() to work in reverse as well.
+    // - Mouse event coordinates to be mirrored.
+    // - Positioning of child Windows.
+    if (QGuiApplication::layoutDirection() == Qt::RightToLeft
+        && (QWindowsIntegration::instance()->options() & QWindowsIntegration::RtlEnabled) != 0) {
+        exStyle |= WS_EX_LAYOUTRTL | WS_EX_NOINHERITLAYOUT;
+    }
+
     // Parent: Use transient parent for top levels.
     if (popup) {
         flags |= Qt::WindowStaysOnTopHint; // a popup stays on top, no parent.
@@ -761,6 +787,16 @@ QWindowsWindowData
 
     QPoint pos = calcPosition(w, context, invMargins);
 
+    // Mirror the position when creating on a parent in RTL mode, ditto for the obtained geometry.
+    int mirrorParentWidth = 0;
+    if (!w->isTopLevel() && QWindowsBaseWindow::isRtlLayout(parentHandle)) {
+        RECT rect;
+        GetClientRect(parentHandle, &rect);
+        mirrorParentWidth = rect.right;
+    }
+    if (mirrorParentWidth != 0 && pos.x() != CW_USEDEFAULT && context->frameWidth != CW_USEDEFAULT)
+        pos.setX(mirrorParentWidth - context->frameWidth - pos.x());
+
     result.hwnd = CreateWindowEx(exStyle, classNameUtf16, titleUtf16,
                                  style,
                                  pos.x(), pos.y(),
@@ -768,14 +804,21 @@ QWindowsWindowData
                                  parentHandle, nullptr, appinst, nullptr);
     qCDebug(lcQpaWindows).nospace()
         << "CreateWindowEx: returns " << w << ' ' << result.hwnd << " obtained geometry: "
-        << context->obtainedGeometry << ' ' << context->margins;
+        << context->obtainedPos << context->obtainedSize << ' ' << context->margins;
 
     if (!result.hwnd) {
         qErrnoWarning("%s: CreateWindowEx failed", __FUNCTION__);
         return result;
     }
 
-    result.geometry = context->obtainedGeometry;
+    if (mirrorParentWidth != 0) {
+        context->obtainedPos.setX(mirrorParentWidth - context->obtainedSize.width()
+                                  -  context->obtainedPos.x());
+    }
+
+    QRect obtainedGeometry(context->obtainedPos, context->obtainedSize);
+
+    result.geometry = obtainedGeometry;
     result.fullFrameMargins = context->margins;
     result.embedded = embedded;
     result.hasFrame = hasFrame;
@@ -859,35 +902,78 @@ static QSize toNativeSizeConstrained(QSize dip, const QWindow *w)
     \ingroup qt-lighthouse-win
 */
 
-QWindowsGeometryHint::QWindowsGeometryHint(const QWindow *w, const QMargins &cm) :
-     minimumSize(toNativeSizeConstrained(w->minimumSize(), w)),
-     maximumSize(toNativeSizeConstrained(w->maximumSize(), w)),
-     customMargins(cm)
+QMargins QWindowsGeometryHint::frameOnPrimaryScreen(DWORD style, DWORD exStyle)
 {
+    RECT rect = {0,0,0,0};
+    style &= ~DWORD(WS_OVERLAPPED); // Not permitted, see docs.
+    if (AdjustWindowRectEx(&rect, style, FALSE, exStyle) == FALSE)
+        qErrnoWarning("%s: AdjustWindowRectEx failed", __FUNCTION__);
+    const QMargins result(qAbs(rect.left), qAbs(rect.top),
+                          qAbs(rect.right), qAbs(rect.bottom));
+    qCDebug(lcQpaWindows).nospace() << __FUNCTION__ << " style="
+        << Qt::showbase << Qt::hex << style << " exStyle=" << exStyle << Qt::dec << Qt::noshowbase
+        << ' ' << rect << ' ' << result;
+    return result;
 }
 
-bool QWindowsGeometryHint::validSize(const QSize &s) const
+QMargins QWindowsGeometryHint::frameOnPrimaryScreen(HWND hwnd)
 {
-    const int width = s.width();
-    const int height = s.height();
-    return width >= minimumSize.width() && width <= maximumSize.width()
-           && height >= minimumSize.height() && height <= maximumSize.height();
+    return frameOnPrimaryScreen(DWORD(GetWindowLongPtr(hwnd, GWL_STYLE)),
+                                DWORD(GetWindowLongPtr(hwnd, GWL_EXSTYLE)));
 }
 
-QMargins QWindowsGeometryHint::frame(DWORD style, DWORD exStyle)
+QMargins QWindowsGeometryHint::frame(DWORD style, DWORD exStyle, qreal dpi)
 {
+    if (QWindowsContext::user32dll.adjustWindowRectExForDpi == nullptr)
+        return frameOnPrimaryScreen(style, exStyle);
     RECT rect = {0,0,0,0};
-    style &= ~(WS_OVERLAPPED); // Not permitted, see docs.
-    if (!AdjustWindowRectEx(&rect, style, FALSE, exStyle))
-        qErrnoWarning("%s: AdjustWindowRectEx failed", __FUNCTION__);
+    style &= ~DWORD(WS_OVERLAPPED); // Not permitted, see docs.
+    if (QWindowsContext::user32dll.adjustWindowRectExForDpi(&rect, style, FALSE, exStyle,
+                                                            unsigned(qRound(dpi))) == FALSE) {
+        qErrnoWarning("%s: AdjustWindowRectExForDpi failed", __FUNCTION__);
+    }
     const QMargins result(qAbs(rect.left), qAbs(rect.top),
                           qAbs(rect.right), qAbs(rect.bottom));
     qCDebug(lcQpaWindows).nospace() << __FUNCTION__ << " style="
         << Qt::showbase << Qt::hex << style << " exStyle=" << exStyle << Qt::dec << Qt::noshowbase
+        << " dpi=" << dpi
         << ' ' << rect << ' ' << result;
     return result;
 }
 
+QMargins QWindowsGeometryHint::frame(HWND hwnd, DWORD style, DWORD exStyle)
+{
+    if (QWindowsScreenManager::isSingleScreen())
+        return frameOnPrimaryScreen(style, exStyle);
+    auto screenManager = QWindowsContext::instance()->screenManager();
+    auto screen = screenManager.screenForHwnd(hwnd);
+    if (!screen)
+        screen = screenManager.screens().value(0);
+    const auto dpi = screen ? screen->logicalDpi().first : qreal(96);
+    return frame(style, exStyle, dpi);
+}
+
+// For newly created windows.
+QMargins QWindowsGeometryHint::frame(const QWindow *w, const QRect &geometry,
+                                     DWORD style, DWORD exStyle)
+{
+    if (!w->isTopLevel() || w->flags().testFlag(Qt::FramelessWindowHint))
+        return {};
+    if (!QWindowsContext::user32dll.adjustWindowRectExForDpi
+        || QWindowsScreenManager::isSingleScreen()
+        || !QWindowsContext::shouldHaveNonClientDpiScaling(w)) {
+        return frameOnPrimaryScreen(style, exStyle);
+    }
+    qreal dpi = 96;
+    auto screenManager = QWindowsContext::instance()->screenManager();
+    auto screen = screenManager.screenAtDp(geometry.center());
+    if (!screen)
+        screen = screenManager.screens().value(0);
+    if (screen)
+        dpi = screen->logicalDpi().first;
+    return QWindowsGeometryHint::frame(style, exStyle, dpi);
+}
+
 bool QWindowsGeometryHint::handleCalculateSize(const QMargins &customMargins, const MSG &msg, LRESULT *result)
 {
     // NCCALCSIZE_PARAMS structure if wParam==TRUE
@@ -907,36 +993,50 @@ bool QWindowsGeometryHint::handleCalculateSize(const QMargins &customMargins, co
     return true;
 }
 
-void QWindowsGeometryHint::applyToMinMaxInfo(HWND hwnd, MINMAXINFO *mmi) const
+void QWindowsGeometryHint::frameSizeConstraints(const QWindow *w, const QMargins &margins,
+                                                QSize *minimumSize, QSize *maximumSize)
 {
-    return applyToMinMaxInfo(DWORD(GetWindowLong(hwnd, GWL_STYLE)),
-                             DWORD(GetWindowLong(hwnd, GWL_EXSTYLE)), mmi);
+    *minimumSize = toNativeSizeConstrained(w->minimumSize(), w);
+    *maximumSize = toNativeSizeConstrained(w->maximumSize(), w);
+
+    const int maximumWidth = qMax(maximumSize->width(), minimumSize->width());
+    const int maximumHeight = qMax(maximumSize->height(), minimumSize->height());
+    const int frameWidth = margins.left() + margins.right();
+    const int frameHeight = margins.top() + margins.bottom();
+
+    if (minimumSize->width() > 0)
+        minimumSize->rwidth() += frameWidth;
+    if (minimumSize->height() > 0)
+        minimumSize->rheight() += frameHeight;
+    if (maximumWidth < QWINDOWSIZE_MAX)
+        maximumSize->setWidth(maximumWidth + frameWidth);
+    if (maximumHeight < QWINDOWSIZE_MAX)
+        maximumSize->setHeight(maximumHeight + frameHeight);
 }
 
-void QWindowsGeometryHint::applyToMinMaxInfo(DWORD style, DWORD exStyle, MINMAXINFO *mmi) const
+void QWindowsGeometryHint::applyToMinMaxInfo(const QWindow *w,
+                                             const QMargins &margins,
+                                             MINMAXINFO *mmi)
 {
+    QSize minimumSize;
+    QSize maximumSize;
+    frameSizeConstraints(w, margins, &minimumSize, &maximumSize);
     qCDebug(lcQpaWindows).nospace() << '>' << __FUNCTION__ << '<' << " min="
         << minimumSize.width() << ',' << minimumSize.height()
         << " max=" << maximumSize.width() << ',' << maximumSize.height()
+        << " margins=" << margins
         << " in " << *mmi;
 
-    const QMargins margins = QWindowsGeometryHint::frame(style, exStyle);
-    const int frameWidth = margins.left() + margins.right() + customMargins.left() + customMargins.right();
-    const int frameHeight = margins.top() + margins.bottom() + customMargins.top() + customMargins.bottom();
     if (minimumSize.width() > 0)
-        mmi->ptMinTrackSize.x = minimumSize.width() + frameWidth;
+        mmi->ptMinTrackSize.x = minimumSize.width();
     if (minimumSize.height() > 0)
-        mmi->ptMinTrackSize.y = minimumSize.height() + frameHeight;
+        mmi->ptMinTrackSize.y = minimumSize.height();
 
-    const int maximumWidth = qMax(maximumSize.width(), minimumSize.width());
-    const int maximumHeight = qMax(maximumSize.height(), minimumSize.height());
-    if (maximumWidth < QWINDOWSIZE_MAX)
-        mmi->ptMaxTrackSize.x = maximumWidth + frameWidth;
-    if (maximumHeight < QWINDOWSIZE_MAX)
-        mmi->ptMaxTrackSize.y = maximumHeight + frameHeight;
-    qCDebug(lcQpaWindows).nospace() << '<' << __FUNCTION__
-        << " frame=" << margins << ' ' << frameWidth << ',' << frameHeight
-        << " out " << *mmi;
+    if (maximumSize.width() < QWINDOWSIZE_MAX)
+        mmi->ptMaxTrackSize.x = maximumSize.width();
+    if (maximumSize.height() < QWINDOWSIZE_MAX)
+        mmi->ptMaxTrackSize.y = maximumSize.height();
+    qCDebug(lcQpaWindows).nospace() << '<' << __FUNCTION__ << " out " << *mmi;
 }
 
 bool QWindowsGeometryHint::positionIncludesFrame(const QWindow *w)
@@ -963,6 +1063,11 @@ bool QWindowsGeometryHint::positionIncludesFrame(const QWindow *w)
     \ingroup qt-lighthouse-win
 */
 
+bool QWindowsBaseWindow::isRtlLayout(HWND hwnd)
+{
+    return (GetWindowLongPtrW(hwnd, GWL_EXSTYLE) & WS_EX_LAYOUTRTL) != 0;
+}
+
 QWindowsBaseWindow *QWindowsBaseWindow::baseWindowOf(const QWindow *w)
 {
     if (w) {
@@ -996,7 +1101,7 @@ QRect QWindowsBaseWindow::geometry_sys() const
 
 QMargins QWindowsBaseWindow::frameMargins_sys() const
 {
-    return QWindowsGeometryHint::frame(style(), exStyle());
+    return QWindowsGeometryHint::frame(handle(), style(), exStyle());
 }
 
 void QWindowsBaseWindow::hide_sys() // Normal hide, do not activate other windows.
@@ -1122,11 +1227,14 @@ void QWindowsForeignWindow::setVisible(bool visible)
 QWindowCreationContext::QWindowCreationContext(const QWindow *w,
                                                const QRect &geometryIn, const QRect &geometry,
                                                const QMargins &cm,
-                                               DWORD style_, DWORD exStyle_) :
-    geometryHint(w, cm), window(w), style(style_), exStyle(exStyle_),
+                                               DWORD style, DWORD exStyle) :
+    window(w),
     requestedGeometryIn(geometryIn),
-    requestedGeometry(geometry), obtainedGeometry(geometry),
-    margins(QWindowsGeometryHint::frame(style, exStyle)), customMargins(cm)
+    requestedGeometry(geometry),
+    obtainedPos(geometryIn.topLeft()),
+    obtainedSize(geometryIn.size()),
+    margins(QWindowsGeometryHint::frame(w, geometry, style, exStyle)),
+    customMargins(cm)
 {
     // Geometry of toplevels does not consider window frames.
     // TODO: No concept of WA_wasMoved yet that would indicate a
@@ -1155,8 +1263,12 @@ QWindowCreationContext::QWindowCreationContext(const QWindow *w,
         << " pos incl. frame=" << QWindowsGeometryHint::positionIncludesFrame(w)
         << " frame=" << frameWidth << 'x' << frameHeight << '+'
         << frameX << '+' << frameY
-        << " min=" << geometryHint.minimumSize << " max=" << geometryHint.maximumSize
-        << " custom margins=" << customMargins;
+        << " margins=" << margins << " custom margins=" << customMargins;
+}
+
+void QWindowCreationContext::applyToMinMaxInfo(MINMAXINFO *mmi) const
+{
+    QWindowsGeometryHint::applyToMinMaxInfo(window, margins + customMargins, mmi);
 }
 
 /*!
@@ -1191,7 +1303,7 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const QWindowsWindowData &data)
     m_cursor(new CursorHandle),
     m_format(aWindow->requestedFormat())
 #if QT_CONFIG(vulkan)
-  , m_vkSurface(0)
+  , m_vkSurface(VK_NULL_HANDLE)
 #endif
 {
     QWindowsContext::instance()->addWindow(m_data.hwnd, this);
@@ -1248,11 +1360,12 @@ void QWindowsWindow::initialize()
     // will send the message) and screen change signals of QWindow.
     if (w->type() != Qt::Desktop) {
         const Qt::WindowState state = w->windowState();
+        const QRect obtainedGeometry(creationContext->obtainedPos, creationContext->obtainedSize);
         if (state != Qt::WindowMaximized && state != Qt::WindowFullScreen
-            && creationContext->requestedGeometryIn != creationContext->obtainedGeometry) {
-            QWindowSystemInterface::handleGeometryChange<QWindowSystemInterface::SynchronousDelivery>(w, creationContext->obtainedGeometry);
+            && creationContext->requestedGeometryIn != obtainedGeometry) {
+            QWindowSystemInterface::handleGeometryChange<QWindowSystemInterface::SynchronousDelivery>(w, obtainedGeometry);
         }
-        QPlatformScreen *obtainedScreen = screenForGeometry(creationContext->obtainedGeometry);
+        QPlatformScreen *obtainedScreen = screenForGeometry(obtainedGeometry);
         if (obtainedScreen && screen() != obtainedScreen)
             QWindowSystemInterface::handleWindowScreenChanged<QWindowSystemInterface::SynchronousDelivery>(w, obtainedScreen->screen());
     }
@@ -1291,14 +1404,14 @@ void QWindowsWindow::destroyWindow()
             QVulkanInstance *inst = window()->vulkanInstance();
             if (inst)
                 static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
-            m_vkSurface = 0;
+            m_vkSurface = VK_NULL_HANDLE;
         }
 #endif
 #ifndef QT_NO_OPENGL
         if (m_surface) {
             if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
                 staticOpenGLContext->destroyWindowSurface(m_surface);
-            m_surface = 0;
+            m_surface = nullptr;
         }
 #endif
         DestroyWindow(m_data.hwnd);
@@ -1672,10 +1785,57 @@ QRect QWindowsWindow::normalGeometry() const
     const bool fakeFullScreen =
         m_savedFrameGeometry.isValid() && (window()->windowStates() & Qt::WindowFullScreen);
     const QRect frame = fakeFullScreen ? m_savedFrameGeometry : normalFrameGeometry(m_data.hwnd);
-    const QMargins margins = fakeFullScreen ? QWindowsGeometryHint::frame(m_savedStyle, 0) : fullFrameMargins();
+    const QMargins margins = fakeFullScreen
+        ? QWindowsGeometryHint::frame(handle(), m_savedStyle, 0)
+        : fullFrameMargins();
     return frame.isValid() ? frame.marginsRemoved(margins) : frame;
 }
 
+static QString msgUnableToSetGeometry(const QWindowsWindow *platformWindow,
+                                      const QRect &requestedRect,
+                                      const QRect &obtainedRect,
+                                      const QMargins &fullMargins,
+                                      const QMargins &customMargins)
+{
+    QString result;
+    QDebug debug(&result);
+    debug.nospace();
+    debug.noquote();
+    const auto window = platformWindow->window();
+    debug << "Unable to set geometry ";
+    formatBriefRectangle(debug, requestedRect);
+    debug << " (frame: ";
+    formatBriefRectangle(debug, requestedRect + fullMargins);
+    debug << ") on " << window->metaObject()->className() << "/\""
+          << window->objectName() << "\" on \"" << window->screen()->name()
+          << "\". Resulting geometry: ";
+    formatBriefRectangle(debug, obtainedRect);
+    debug << " (frame: ";
+    formatBriefRectangle(debug, obtainedRect + fullMargins);
+    debug << ") margins: ";
+    formatBriefMargins(debug, fullMargins);
+    if (!customMargins.isNull()) {
+       debug << " custom margin: ";
+       formatBriefMargins(debug, customMargins);
+    }
+    const auto minimumSize = window->minimumSize();
+    const bool hasMinimumSize = !minimumSize.isEmpty();
+    if (hasMinimumSize)
+        debug << " minimum size: " << minimumSize.width() << 'x' << minimumSize.height();
+    const auto maximumSize = window->maximumSize();
+    const bool hasMaximumSize = maximumSize.width() != QWINDOWSIZE_MAX || maximumSize.height() != QWINDOWSIZE_MAX;
+    if (hasMaximumSize)
+        debug << " maximum size: " << maximumSize.width() << 'x' << maximumSize.height();
+    if (hasMinimumSize || hasMaximumSize) {
+        MINMAXINFO minmaxInfo;
+        memset(&minmaxInfo, 0, sizeof(minmaxInfo));
+        platformWindow->getSizeHints(&minmaxInfo);
+        debug << ' ' << minmaxInfo;
+    }
+    debug << ')';
+    return result;
+}
+
 void QWindowsWindow::setGeometry(const QRect &rectIn)
 {
     QRect rect = rectIn;
@@ -1695,21 +1855,10 @@ void QWindowsWindow::setGeometry(const QRect &rectIn)
         setGeometry_sys(rect);
         clearFlag(WithinSetGeometry);
         if (m_data.geometry != rect && (isVisible() || QLibraryInfo::isDebugBuild())) {
-            qWarning("%s: Unable to set geometry %dx%d+%d+%d on %s/'%s'."
-                     " Resulting geometry:  %dx%d+%d+%d "
-                     "(frame: %d, %d, %d, %d, custom margin: %d, %d, %d, %d"
-                     ", minimum size: %dx%d, maximum size: %dx%d).",
-                     __FUNCTION__,
-                     rect.width(), rect.height(), rect.x(), rect.y(),
-                     window()->metaObject()->className(), qPrintable(window()->objectName()),
-                     m_data.geometry.width(), m_data.geometry.height(),
-                     m_data.geometry.x(), m_data.geometry.y(),
-                     m_data.fullFrameMargins.left(), m_data.fullFrameMargins.top(),
-                     m_data.fullFrameMargins.right(), m_data.fullFrameMargins.bottom(),
-                     m_data.customMargins.left(), m_data.customMargins.top(),
-                     m_data.customMargins.right(), m_data.customMargins.bottom(),
-                     window()->minimumWidth(), window()->minimumHeight(),
-                     window()->maximumWidth(), window()->maximumHeight());
+            const auto warning =
+                msgUnableToSetGeometry(this, rectIn, m_data.geometry,
+                                       m_data.fullFrameMargins, m_data.customMargins);
+            qWarning("%s: %s", __FUNCTION__, qPrintable(warning));
         }
     } else {
         QPlatformWindow::setGeometry(rect);
@@ -1753,27 +1902,41 @@ void QWindowsWindow::handleResized(int wParam)
     }
 }
 
-void QWindowsWindow::checkForScreenChanged()
+static inline bool equalDpi(const QDpi &d1, const QDpi &d2)
+{
+    return qFuzzyCompare(d1.first, d2.first) && qFuzzyCompare(d1.second, d2.second);
+}
+
+void QWindowsWindow::checkForScreenChanged(ScreenChangeMode mode)
 {
-    if (parent())
+    if (parent() || QWindowsScreenManager::isSingleScreen())
         return;
 
     QPlatformScreen *currentScreen = screen();
-    const auto &screenManager = QWindowsContext::instance()->screenManager();
-    const QWindowsScreen *newScreen = screenManager.screenForHwnd(m_data.hwnd);
-    if (newScreen != nullptr && newScreen != currentScreen) {
-        qCDebug(lcQpaWindows).noquote().nospace() << __FUNCTION__
-            << ' ' << window() << " \"" << currentScreen->name()
-            << "\"->\"" << newScreen->name() << '"';
-        setFlag(SynchronousGeometryChangeEvent);
-        QWindowSystemInterface::handleWindowScreenChanged(window(), newScreen->screen());
+    const QWindowsScreen *newScreen =
+        QWindowsContext::instance()->screenManager().screenForHwnd(m_data.hwnd);
+    if (newScreen == nullptr || newScreen == currentScreen)
+        return;
+    // For screens with different DPI: postpone until WM_DPICHANGE
+    if (mode == FromGeometryChange
+        && !equalDpi(currentScreen->logicalDpi(), newScreen->logicalDpi())) {
+        return;
     }
+    qCDebug(lcQpaWindows).noquote().nospace() << __FUNCTION__
+        << ' ' << window() << " \"" << currentScreen->name()
+        << "\"->\"" << newScreen->name() << '"';
+    if (mode == FromGeometryChange)
+        setFlag(SynchronousGeometryChangeEvent);
+    updateFullFrameMargins();
+    QWindowSystemInterface::handleWindowScreenChanged(window(), newScreen->screen());
 }
 
 void QWindowsWindow::handleGeometryChange()
 {
     const QRect previousGeometry = m_data.geometry;
     m_data.geometry = geometry_sys();
+    if (testFlag(WithinDpiChanged))
+        return;  // QGuiApplication will send resize
     QWindowSystemInterface::handleGeometryChange(window(), m_data.geometry);
     // QTBUG-32121: OpenGL/normal windows (with exception of ANGLE) do not receive
     // expose events when shrinking, synthesize.
@@ -1819,7 +1982,16 @@ void QWindowsBaseWindow::setGeometry_sys(const QRect &rect) const
         windowPlacement.showCmd = windowPlacement.showCmd == SW_SHOWMINIMIZED ? SW_SHOWMINIMIZED : SW_HIDE;
         result = SetWindowPlacement(hwnd, &windowPlacement);
     } else {
-        result = MoveWindow(hwnd, frameGeometry.x(), frameGeometry.y(),
+        int x = frameGeometry.x();
+        if (!window()->isTopLevel()) {
+            const HWND parentHandle = GetParent(hwnd);
+            if (isRtlLayout(parentHandle)) {
+                RECT rect;
+                GetClientRect(parentHandle, &rect);
+                x = rect.right - frameGeometry.width() - x;
+            }
+        }
+        result = MoveWindow(hwnd, x, frameGeometry.y(),
                             frameGeometry.width(), frameGeometry.height(), true);
     }
     qCDebug(lcQpaWindows) << '<' << __FUNCTION__ << window()
@@ -1835,8 +2007,11 @@ void QWindowsBaseWindow::setGeometry_sys(const QRect &rect) const
 
 HDC QWindowsWindow::getDC()
 {
-    if (!m_hdc)
+    if (!m_hdc) {
         m_hdc = GetDC(handle());
+        if (QGuiApplication::layoutDirection() == Qt::RightToLeft)
+            SetLayout(m_hdc, 0); // Clear RTL layout
+    }
     return m_hdc;
 }
 
@@ -1876,6 +2051,9 @@ bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
 {
     if (message == WM_ERASEBKGND) // Backing store - ignored.
         return true;
+    // QTBUG-75455: Suppress WM_PAINT sent to invisible windows when setting WS_EX_LAYERED
+    if (!window()->isVisible() && (GetWindowLong(hwnd, GWL_EXSTYLE) & WS_EX_LAYERED) != 0)
+        return false;
     // Ignore invalid update bounding rectangles
     RECT updateRect;
     if (!GetUpdateRect(m_data.hwnd, &updateRect, FALSE))
@@ -2233,6 +2411,15 @@ void QWindowsWindow::setFullFrameMargins(const QMargins &newMargins)
     }
 }
 
+void QWindowsWindow::updateFullFrameMargins()
+{
+    // Normally obtained from WM_NCCALCSIZE
+    const auto systemMargins = testFlag(DisableNonClientScaling)
+        ? QWindowsGeometryHint::frameOnPrimaryScreen(m_data.hwnd)
+        : frameMargins_sys();
+    setFullFrameMargins(systemMargins + m_data.customMargins);
+}
+
 QMargins QWindowsWindow::frameMargins() const
 {
     QMargins result = fullFrameMargins();
@@ -2443,10 +2630,8 @@ void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const
 {
     // We don't apply the min/max size hint as we change the dpi, because we did not adjust the
     // QScreen of the window yet so we don't have the min/max with the right ratio
-    if (!testFlag(QWindowsWindow::WithinDpiChanged)) {
-        const QWindowsGeometryHint hint(window(), m_data.customMargins);
-        hint.applyToMinMaxInfo(m_data.hwnd, mmi);
-    }
+    if (!testFlag(QWindowsWindow::WithinDpiChanged))
+        QWindowsGeometryHint::applyToMinMaxInfo(window(), fullFrameMargins(), mmi);
 
     // This block fixes QTBUG-8361, QTBUG-4362: Frameless/title-less windows shouldn't cover the
     // taskbar when maximized
@@ -2758,14 +2943,14 @@ void QWindowsWindow::invalidateSurface()
         QVulkanInstance *inst = window()->vulkanInstance();
         if (inst)
             static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
-        m_vkSurface = 0;
+        m_vkSurface = VK_NULL_HANDLE;
     }
 #endif
 #ifndef QT_NO_OPENGL
     if (m_surface) {
         if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
             staticOpenGLContext->destroyWindowSurface(m_surface);
-        m_surface = 0;
+        m_surface = nullptr;
     }
 #endif // QT_NO_OPENGL
 }
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 0d8096ddfa..7efbcf900c 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -59,24 +59,23 @@ class QDebug;
 
 struct QWindowsGeometryHint
 {
-    QWindowsGeometryHint() = default;
-    explicit QWindowsGeometryHint(const QWindow *w, const QMargins &customMargins);
-    static QMargins frame(DWORD style, DWORD exStyle);
+    static QMargins frameOnPrimaryScreen(DWORD style, DWORD exStyle);
+    static QMargins frameOnPrimaryScreen(HWND hwnd);
+    static QMargins frame(DWORD style, DWORD exStyle, qreal dpi);
+    static QMargins frame(HWND hwnd, DWORD style, DWORD exStyle);
+    static QMargins frame(const QWindow *w, const QRect &geometry,
+                          DWORD style, DWORD exStyle);
     static bool handleCalculateSize(const QMargins &customMargins, const MSG &msg, LRESULT *result);
-    void applyToMinMaxInfo(DWORD style, DWORD exStyle, MINMAXINFO *mmi) const;
-    void applyToMinMaxInfo(HWND hwnd, MINMAXINFO *mmi) const;
-    bool validSize(const QSize &s) const;
-
+    static void applyToMinMaxInfo(const QWindow *w, const QMargins &margins,
+                                  MINMAXINFO *mmi);
+    static void frameSizeConstraints(const QWindow *w, const QMargins &margins,
+                                     QSize *minimumSize, QSize *maximumSize);
     static inline QPoint mapToGlobal(HWND hwnd, const QPoint &);
     static inline QPoint mapToGlobal(const QWindow *w, const QPoint &);
     static inline QPoint mapFromGlobal(const HWND hwnd, const QPoint &);
     static inline QPoint mapFromGlobal(const QWindow *w, const QPoint &);
 
     static bool positionIncludesFrame(const QWindow *w);
-
-    QSize minimumSize;
-    QSize maximumSize;
-    QMargins customMargins;
 };
 
 struct QWindowCreationContext
@@ -85,16 +84,13 @@ struct QWindowCreationContext
                                     const QRect &geometryIn, const QRect &geometry,
                                     const QMargins &customMargins,
                                     DWORD style, DWORD exStyle);
-    void applyToMinMaxInfo(MINMAXINFO *mmi) const
-        { geometryHint.applyToMinMaxInfo(style, exStyle, mmi); }
+    void applyToMinMaxInfo(MINMAXINFO *mmi) const;
 
-    QWindowsGeometryHint geometryHint;
     const QWindow *window;
-    DWORD style;
-    DWORD exStyle;
     QRect requestedGeometryIn; // QWindow scaled
     QRect requestedGeometry; // after QPlatformWindow::initialGeometry()
-    QRect obtainedGeometry;
+    QPoint obtainedPos;
+    QSize obtainedSize;
     QMargins margins;
     QMargins customMargins;  // User-defined, additional frame for WM_NCCALCSIZE
     int frameX = CW_USEDEFAULT; // Passed on to CreateWindowEx(), including frame.
@@ -110,7 +106,7 @@ struct QWindowsWindowData
     QRect geometry;
     QMargins fullFrameMargins; // Do not use directly for windows, see FrameDirty.
     QMargins customMargins;    // User-defined, additional frame for NCCALCSIZE
-    HWND hwnd = 0;
+    HWND hwnd = nullptr;
     bool embedded = false;
     bool hasFrame = false;
 
@@ -121,7 +117,7 @@ struct QWindowsWindowData
 
 class QWindowsBaseWindow : public QPlatformWindow
 {
-    Q_DISABLE_COPY(QWindowsBaseWindow)
+    Q_DISABLE_COPY_MOVE(QWindowsBaseWindow)
 public:
     explicit QWindowsBaseWindow(QWindow *window) : QPlatformWindow(window) {}
 
@@ -139,6 +135,7 @@ public:
 
     unsigned style() const   { return GetWindowLongPtr(handle(), GWL_STYLE); }
     unsigned exStyle() const { return GetWindowLongPtr(handle(), GWL_EXSTYLE); }
+    static bool isRtlLayout(HWND hwnd);
 
     static QWindowsBaseWindow *baseWindowOf(const QWindow *w);
     static HWND handleOf(const QWindow *w);
@@ -221,7 +218,8 @@ public:
         HasBorderInFullScreen = 0x200000,
         WithinDpiChanged = 0x400000,
         VulkanSurface = 0x800000,
-        ResizeMoveActive = 0x1000000
+        ResizeMoveActive = 0x1000000,
+        DisableNonClientScaling = 0x2000000
     };
 
     QWindowsWindow(QWindow *window, const QWindowsWindowData &data);
@@ -262,6 +260,7 @@ public:
     QMargins frameMargins() const override;
     QMargins fullFrameMargins() const override;
     void setFullFrameMargins(const QMargins &newMargins);
+    void updateFullFrameMargins();
 
     void setOpacity(qreal level) override;
     void setMask(const QRegion &region) override;
@@ -337,7 +336,8 @@ public:
     void alertWindow(int durationMs = 0);
     void stopAlertWindow();
 
-    void checkForScreenChanged();
+    enum ScreenChangeMode { FromGeometryChange, FromDpiChange };
+    void checkForScreenChanged(ScreenChangeMode mode = FromGeometryChange);
 
     static void setTouchWindowTouchTypeStatic(QWindow *window, QWindowsWindowFunctions::TouchWindowTouchTypes touchTypes);
     void registerTouchWindow(QWindowsWindowFunctions::TouchWindowTouchTypes touchTypes = QWindowsWindowFunctions::NormalTouch);
@@ -357,7 +357,7 @@ private:
     inline void setParent_sys(const QPlatformWindow *parent);
     inline void updateTransientParent() const;
     void destroyWindow();
-    inline bool isDropSiteEnabled() const { return m_dropTarget != 0; }
+    inline bool isDropSiteEnabled() const { return m_dropTarget != nullptr; }
     void setDropSiteEnabled(bool enabled);
     void updateDropSite(bool topLevel);
     void handleGeometryChange();
@@ -368,7 +368,7 @@ private:
     mutable QWindowsWindowData m_data;
     QPointer<QWindowsMenuBar> m_menuBar;
     mutable unsigned m_flags = WithinCreate;
-    HDC m_hdc = 0;
+    HDC m_hdc = nullptr;
     Qt::WindowStates m_windowState = Qt::WindowNoState;
     qreal m_opacity = 1;
 #ifndef QT_NO_CURSOR
@@ -378,15 +378,15 @@ private:
     unsigned m_savedStyle = 0;
     QRect m_savedFrameGeometry;
     const QSurfaceFormat m_format;
-    HICON m_iconSmall = 0;
-    HICON m_iconBig = 0;
+    HICON m_iconSmall = nullptr;
+    HICON m_iconBig = nullptr;
     void *m_surface = nullptr;
 
     static bool m_screenForGLInitialized;
 
 #if QT_CONFIG(vulkan)
     // note: intentionally not using void * in order to avoid breaking x86
-    VkSurfaceKHR m_vkSurface = 0;
+    VkSurfaceKHR m_vkSurface = VK_NULL_HANDLE;
 #endif
     static bool m_borderInFullScreenDefault;
 };
@@ -401,18 +401,38 @@ QDebug operator<<(QDebug d, const WINDOWPOS &);
 QDebug operator<<(QDebug d, const GUID &guid);
 #endif // !QT_NO_DEBUG_STREAM
 
+static inline void clientToScreen(HWND hwnd, POINT *wP)
+{
+    if (QWindowsBaseWindow::isRtlLayout(hwnd)) {
+        RECT clientArea;
+        GetClientRect(hwnd, &clientArea);
+        wP->x = clientArea.right - wP->x;
+    }
+    ClientToScreen(hwnd, wP);
+}
+
+static inline void screenToClient(HWND hwnd, POINT *wP)
+{
+    ScreenToClient(hwnd, wP);
+    if (QWindowsBaseWindow::isRtlLayout(hwnd)) {
+        RECT clientArea;
+        GetClientRect(hwnd, &clientArea);
+        wP->x = clientArea.right - wP->x;
+    }
+}
+
 // ---------- QWindowsGeometryHint inline functions.
 QPoint QWindowsGeometryHint::mapToGlobal(HWND hwnd, const QPoint &qp)
 {
     POINT p = { qp.x(), qp.y() };
-    ClientToScreen(hwnd, &p);
+    clientToScreen(hwnd, &p);
     return QPoint(p.x, p.y);
 }
 
 QPoint QWindowsGeometryHint::mapFromGlobal(const HWND hwnd, const QPoint &qp)
 {
     POINT p = { qp.x(), qp.y() };
-    ScreenToClient(hwnd, &p);
+    screenToClient(hwnd, &p);
     return QPoint(p.x, p.y);
 }
 
@@ -451,11 +471,11 @@ inline void QWindowsWindow::destroyIcon()
 {
     if (m_iconBig) {
         DestroyIcon(m_iconBig);
-        m_iconBig = 0;
+        m_iconBig = nullptr;
     }
     if (m_iconSmall) {
         DestroyIcon(m_iconSmall);
-        m_iconSmall = 0;
+        m_iconSmall = nullptr;
     }
 }
 
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiabaseprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiabaseprovider.h
index 9caa7d6898..a20df28e3f 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiabaseprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiabaseprovider.h
@@ -57,7 +57,7 @@ class QAccessibleInterface;
 class QWindowsUiaBaseProvider : public QObject
 {
     Q_OBJECT
-    Q_DISABLE_COPY(QWindowsUiaBaseProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaBaseProvider)
 public:
     explicit QWindowsUiaBaseProvider(QAccessible::Id id);
     virtual ~QWindowsUiaBaseProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiagriditemprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiagriditemprovider.h
index 3d17056d38..3244122038 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiagriditemprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiagriditemprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaGridItemProvider : public QWindowsUiaBaseProvider,
                                     public QWindowsComBase<IGridItemProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaGridItemProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaGridItemProvider)
 public:
     explicit QWindowsUiaGridItemProvider(QAccessible::Id id);
     virtual ~QWindowsUiaGridItemProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiagridprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiagridprovider.h
index b96fc1a93c..0e5f81108e 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiagridprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiagridprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaGridProvider : public QWindowsUiaBaseProvider,
                                 public QWindowsComBase<IGridProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaGridProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaGridProvider)
 public:
     explicit QWindowsUiaGridProvider(QAccessible::Id id);
     virtual ~QWindowsUiaGridProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiainvokeprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiainvokeprovider.h
index 5fb509c5f3..7d646894a1 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiainvokeprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiainvokeprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaInvokeProvider : public QWindowsUiaBaseProvider,
                                   public QWindowsComBase<IInvokeProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaInvokeProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaInvokeProvider)
 public:
     explicit QWindowsUiaInvokeProvider(QAccessible::Id id);
     virtual ~QWindowsUiaInvokeProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
index 44328492a6..a427e553f0 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
@@ -52,6 +52,7 @@
 #include "qwindowsuiatableitemprovider.h"
 #include "qwindowsuiagridprovider.h"
 #include "qwindowsuiagriditemprovider.h"
+#include "qwindowsuiawindowprovider.h"
 #include "qwindowscombase.h"
 #include "qwindowscontext.h"
 #include "qwindowsuiautils.h"
@@ -263,6 +264,11 @@ HRESULT QWindowsUiaMainProvider::GetPatternProvider(PATTERNID idPattern, IUnknow
         return UIA_E_ELEMENTNOTAVAILABLE;
 
     switch (idPattern) {
+    case UIA_WindowPatternId:
+        if (accessible->parent() && (accessible->parent()->role() == QAccessible::Application)) {
+            *pRetVal = new QWindowsUiaWindowProvider(id());
+        }
+        break;
     case UIA_TextPatternId:
     case UIA_TextPattern2Id:
         // All text controls.
@@ -352,8 +358,7 @@ HRESULT QWindowsUiaMainProvider::GetPropertyValue(PROPERTYID idProp, VARIANT *pR
     if (!accessible)
         return UIA_E_ELEMENTNOTAVAILABLE;
 
-    bool clientTopLevel = (accessible->role() == QAccessible::Client)
-            && accessible->parent() && (accessible->parent()->role() == QAccessible::Application);
+    bool topLevelWindow = accessible->parent() && (accessible->parent()->role() == QAccessible::Application);
 
     switch (idProp) {
     case UIA_ProcessIdPropertyId:
@@ -379,7 +384,7 @@ HRESULT QWindowsUiaMainProvider::GetPropertyValue(PROPERTYID idProp, VARIANT *pR
         setVariantString(QStringLiteral("Qt"), pRetVal);
         break;
     case UIA_ControlTypePropertyId:
-        if (clientTopLevel) {
+        if (topLevelWindow) {
             // Reports a top-level widget as a window, instead of "custom".
             setVariantI4(UIA_WindowControlTypeId, pRetVal);
         } else {
@@ -391,10 +396,20 @@ HRESULT QWindowsUiaMainProvider::GetPropertyValue(PROPERTYID idProp, VARIANT *pR
         setVariantString(accessible->text(QAccessible::Help), pRetVal);
         break;
     case UIA_HasKeyboardFocusPropertyId:
-        setVariantBool(accessible->state().focused, pRetVal);
+        if (topLevelWindow) {
+            // Windows set the active state to true when they are focused
+            setVariantBool(accessible->state().active, pRetVal);
+        } else {
+            setVariantBool(accessible->state().focused, pRetVal);
+        }
         break;
     case UIA_IsKeyboardFocusablePropertyId:
-        setVariantBool(accessible->state().focusable, pRetVal);
+        if (topLevelWindow) {
+            // Windows should always be focusable
+            setVariantBool(true, pRetVal);
+        } else {
+            setVariantBool(accessible->state().focusable, pRetVal);
+        }
         break;
     case UIA_IsOffscreenPropertyId:
         setVariantBool(accessible->state().offscreen, pRetVal);
@@ -424,7 +439,7 @@ HRESULT QWindowsUiaMainProvider::GetPropertyValue(PROPERTYID idProp, VARIANT *pR
         break;
     case UIA_NamePropertyId: {
         QString name = accessible->text(QAccessible::Name);
-        if (name.isEmpty() && clientTopLevel)
+        if (name.isEmpty() && topLevelWindow)
            name = QCoreApplication::applicationName();
         setVariantString(name, pRetVal);
         break;
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
index df0d60f9c9..cdc239ed99 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.h
@@ -60,7 +60,7 @@ class QWindowsUiaMainProvider :
     public IRawElementProviderFragmentRoot
 {
     Q_OBJECT
-    Q_DISABLE_COPY(QWindowsUiaMainProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaMainProvider)
 public:
     static QWindowsUiaMainProvider *providerForAccessible(QAccessibleInterface *accessible);
     explicit QWindowsUiaMainProvider(QAccessibleInterface *a, int initialRefCount = 1);
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiarangevalueprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiarangevalueprovider.h
index c5e0a03ee5..fc82d3a2cc 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiarangevalueprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiarangevalueprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaRangeValueProvider : public QWindowsUiaBaseProvider,
                                       public QWindowsComBase<IRangeValueProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaRangeValueProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaRangeValueProvider)
 public:
     explicit QWindowsUiaRangeValueProvider(QAccessible::Id id);
     virtual ~QWindowsUiaRangeValueProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionitemprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionitemprovider.h
index 1f2605188b..4b59c4e40f 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionitemprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionitemprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaSelectionItemProvider : public QWindowsUiaBaseProvider,
                                          public QWindowsComBase<ISelectionItemProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaSelectionItemProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaSelectionItemProvider)
 public:
     explicit QWindowsUiaSelectionItemProvider(QAccessible::Id id);
     virtual ~QWindowsUiaSelectionItemProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionprovider.h
index 0376d25804..ee1044ec7a 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaselectionprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaSelectionProvider : public QWindowsUiaBaseProvider,
                                      public QWindowsComBase<ISelectionProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaSelectionProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaSelectionProvider)
 public:
     explicit QWindowsUiaSelectionProvider(QAccessible::Id id);
     virtual ~QWindowsUiaSelectionProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiatableitemprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiatableitemprovider.h
index bf4b52ee0b..9804c35f8e 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiatableitemprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiatableitemprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaTableItemProvider : public QWindowsUiaBaseProvider,
                                      public QWindowsComBase<ITableItemProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaTableItemProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaTableItemProvider)
 public:
     explicit QWindowsUiaTableItemProvider(QAccessible::Id id);
     virtual ~QWindowsUiaTableItemProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiatableprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiatableprovider.h
index 94c8ab93a7..a8b16035ec 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiatableprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiatableprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaTableProvider : public QWindowsUiaBaseProvider,
                                  public QWindowsComBase<ITableProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaTableProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaTableProvider)
 public:
     explicit QWindowsUiaTableProvider(QAccessible::Id id);
     virtual ~QWindowsUiaTableProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiatextprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiatextprovider.h
index a9be70fa16..ffab48b0e8 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiatextprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiatextprovider.h
@@ -52,7 +52,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaTextProvider : public QWindowsUiaBaseProvider,
                                 public QWindowsComBase<ITextProvider2>
 {
-    Q_DISABLE_COPY(QWindowsUiaTextProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaTextProvider)
 public:
     explicit QWindowsUiaTextProvider(QAccessible::Id id);
     ~QWindowsUiaTextProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiatextrangeprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiatextrangeprovider.h
index 39b9069fc0..3b4ec63ceb 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiatextrangeprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiatextrangeprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaTextRangeProvider : public QWindowsUiaBaseProvider,
                                      public QWindowsComBase<ITextRangeProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaTextRangeProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaTextRangeProvider)
 public:
     explicit QWindowsUiaTextRangeProvider(QAccessible::Id id, int startOffset, int endOffset);
     virtual ~QWindowsUiaTextRangeProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiatoggleprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiatoggleprovider.h
index 2bed6f7e36..892b635b41 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiatoggleprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiatoggleprovider.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaToggleProvider : public QWindowsUiaBaseProvider,
                                   public QWindowsComBase<IToggleProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaToggleProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaToggleProvider)
 public:
     explicit QWindowsUiaToggleProvider(QAccessible::Id id);
     virtual ~QWindowsUiaToggleProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiavalueprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiavalueprovider.h
index 334a17e51d..3edfe7a08b 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiavalueprovider.h
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiavalueprovider.h
@@ -52,7 +52,7 @@ QT_BEGIN_NAMESPACE
 class QWindowsUiaValueProvider : public QWindowsUiaBaseProvider,
                                  public QWindowsComBase<IValueProvider>
 {
-    Q_DISABLE_COPY(QWindowsUiaValueProvider)
+    Q_DISABLE_COPY_MOVE(QWindowsUiaValueProvider)
 public:
     explicit QWindowsUiaValueProvider(QAccessible::Id id);
     virtual ~QWindowsUiaValueProvider();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.cpp
new file mode 100644
index 0000000000..3738aa72ff
--- /dev/null
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.cpp
@@ -0,0 +1,168 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui/qtguiglobal.h>
+#if QT_CONFIG(accessibility)
+
+#include "qwindowsuiawindowprovider.h"
+#include "qwindowsuiautils.h"
+#include "qwindowscontext.h"
+
+#include <QtGui/qaccessible.h>
+#include <QtGui/private/qwindow_p.h>
+#include <QtCore/qloggingcategory.h>
+#include <QtCore/qstring.h>
+
+QT_BEGIN_NAMESPACE
+
+using namespace QWindowsUiAutomation;
+
+
+QWindowsUiaWindowProvider::QWindowsUiaWindowProvider(QAccessible::Id id) :
+    QWindowsUiaBaseProvider(id)
+{
+}
+
+QWindowsUiaWindowProvider::~QWindowsUiaWindowProvider()
+{
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::SetVisualState(WindowVisualState state) {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+    auto window = accessible->window();
+    switch (state) {
+    case WindowVisualState_Normal:
+        window->showNormal();
+        break;
+    case WindowVisualState_Maximized:
+        window->showMaximized();
+        break;
+    case WindowVisualState_Minimized:
+        window->showMinimized();
+        break;
+    }
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::Close() {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+    accessible->window()->close();
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::WaitForInputIdle(int milliseconds, __RPC__out BOOL *pRetVal) {
+    Q_UNUSED(milliseconds);
+    Q_UNUSED(pRetVal);
+    return UIA_E_NOTSUPPORTED;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_CanMaximize(__RPC__out BOOL *pRetVal) {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+
+    auto window = accessible->window();
+    auto flags = window->flags();
+
+    *pRetVal = (!(flags & Qt::MSWindowsFixedSizeDialogHint)
+                && (flags & Qt::WindowMaximizeButtonHint)
+                && ((flags & Qt::CustomizeWindowHint)
+                    || window->maximumSize() == QSize(QWINDOWSIZE_MAX, QWINDOWSIZE_MAX)));
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_CanMinimize(__RPC__out BOOL *pRetVal) {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+    *pRetVal = accessible->window()->flags() & Qt::WindowMinimizeButtonHint;
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_IsModal(__RPC__out BOOL *pRetVal) {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+    *pRetVal = accessible->window()->isModal();
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_WindowVisualState(__RPC__out enum WindowVisualState *pRetVal) {
+    qCDebug(lcQpaUiAutomation) << __FUNCTION__;
+    QAccessibleInterface *accessible = accessibleInterface();
+    if (!accessible || !accessible->window())
+        return UIA_E_ELEMENTNOTAVAILABLE;
+    auto visibility = accessible->window()->visibility();
+    switch (visibility) {
+    case QWindow::FullScreen:
+    case QWindow::Maximized:
+        *pRetVal = WindowVisualState_Maximized;
+        break;
+    case QWindow::Minimized:
+        *pRetVal = WindowVisualState_Minimized;
+        break;
+    default:
+        *pRetVal = WindowVisualState_Normal;
+        break;
+    }
+    return S_OK;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_WindowInteractionState(__RPC__out enum WindowInteractionState *pRetVal) {
+    Q_UNUSED(pRetVal);
+    return UIA_E_NOTSUPPORTED;
+}
+
+HRESULT STDMETHODCALLTYPE QWindowsUiaWindowProvider::get_IsTopmost(__RPC__out BOOL *pRetVal) {
+    Q_UNUSED(pRetVal);
+    return UIA_E_NOTSUPPORTED;
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(accessibility)
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.h b/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.h
new file mode 100644
index 0000000000..343fb275f7
--- /dev/null
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiawindowprovider.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINDOWSUIAWINDOWPROVIDER_H
+#define QWINDOWSUIAWINDOWPROVIDER_H
+
+#include <QtGui/qtguiglobal.h>
+#if QT_CONFIG(accessibility)
+
+#include "qwindowsuiabaseprovider.h"
+
+QT_BEGIN_NAMESPACE
+
+class QWindowsUiaWindowProvider : public QWindowsUiaBaseProvider,
+                                  public QWindowsComBase<IWindowProvider>
+{
+    Q_DISABLE_COPY(QWindowsUiaWindowProvider)
+public:
+    explicit QWindowsUiaWindowProvider(QAccessible::Id id);
+    ~QWindowsUiaWindowProvider() override;
+
+    HRESULT STDMETHODCALLTYPE SetVisualState(WindowVisualState state) override;
+    HRESULT STDMETHODCALLTYPE Close( void) override;
+    HRESULT STDMETHODCALLTYPE WaitForInputIdle(int milliseconds, __RPC__out BOOL *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_CanMaximize(__RPC__out BOOL *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_CanMinimize(__RPC__out BOOL *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_IsModal(__RPC__out BOOL *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_WindowVisualState(__RPC__out WindowVisualState *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_WindowInteractionState(__RPC__out WindowInteractionState *pRetVal) override;
+    HRESULT STDMETHODCALLTYPE get_IsTopmost(__RPC__out BOOL *pRetVal) override;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(accessibility)
+
+#endif // QWINDOWSUIAWINDOWPROVIDER_H
diff --git a/src/plugins/platforms/windows/uiautomation/uiautomation.pri b/src/plugins/platforms/windows/uiautomation/uiautomation.pri
index b79e42cdec..ee9332e7ea 100644
--- a/src/plugins/platforms/windows/uiautomation/uiautomation.pri
+++ b/src/plugins/platforms/windows/uiautomation/uiautomation.pri
@@ -18,6 +18,7 @@ SOURCES += \
     $$PWD/qwindowsuiatableitemprovider.cpp \
     $$PWD/qwindowsuiagridprovider.cpp \
     $$PWD/qwindowsuiagriditemprovider.cpp \
+    $$PWD/qwindowsuiawindowprovider.cpp \
     $$PWD/qwindowsuiautils.cpp
 
 HEADERS += \
@@ -37,6 +38,7 @@ HEADERS += \
     $$PWD/qwindowsuiatableitemprovider.h \
     $$PWD/qwindowsuiagridprovider.h \
     $$PWD/qwindowsuiagriditemprovider.h \
+    $$PWD/qwindowsuiawindowprovider.h \
     $$PWD/qwindowsuiautils.h
 
 mingw: QMAKE_USE *= uuid
diff --git a/src/plugins/platforms/winrt/qwinrttheme.cpp b/src/plugins/platforms/winrt/qwinrttheme.cpp
index 283825a880..0e1504b1c1 100644
--- a/src/plugins/platforms/winrt/qwinrttheme.cpp
+++ b/src/plugins/platforms/winrt/qwinrttheme.cpp
@@ -44,6 +44,8 @@
 #include <QtCore/qfunctions_winrt.h>
 #include <QtGui/QPalette>
 
+#include <QtFontDatabaseSupport/private/qwinrtfontdatabase_p.h>
+
 #include <wrl.h>
 #include <windows.ui.h>
 #include <windows.ui.viewmanagement.h>
@@ -96,7 +98,13 @@ static IUISettings *uiSettings()
 class QWinRTThemePrivate
 {
 public:
+    QWinRTThemePrivate()
+        : monospaceFont(QWinRTFontDatabase::familyForStyleHint(QFont::Monospace))
+    {
+    }
+
     QPalette palette;
+    QFont monospaceFont;
 };
 
 static inline QColor fromColor(const Color &color)
@@ -321,4 +329,14 @@ const QPalette *QWinRTTheme::palette(Palette type) const
     return QPlatformTheme::palette(type);
 }
 
+const QFont *QWinRTTheme::font(QPlatformTheme::Font type) const
+{
+    Q_D(const QWinRTTheme);
+    qCDebug(lcQpaTheme) << __FUNCTION__ << type;
+    if (type == QPlatformTheme::FixedFont)
+        return &d->monospaceFont;
+
+    return QPlatformTheme::font(type);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/winrt/qwinrttheme.h b/src/plugins/platforms/winrt/qwinrttheme.h
index cc5fc851e7..acf5a54a94 100644
--- a/src/plugins/platforms/winrt/qwinrttheme.h
+++ b/src/plugins/platforms/winrt/qwinrttheme.h
@@ -58,6 +58,7 @@ public:
     QPlatformDialogHelper *createPlatformDialogHelper(DialogType type) const override;
 
     const QPalette *palette(Palette type = SystemPalette) const override;
+    const QFont *font(Font type = SystemFont) const override;
 
     static QVariant styleHint(QPlatformIntegration::StyleHint hint);
     QVariant themeHint(ThemeHint hint) const override;
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index e4da207b00..bc09fe2f91 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -240,6 +240,10 @@ void QXcbConnection::xi2SetupDevice(void *info, bool removeExisting)
     } else if (name.contains("uc-logic") && isTablet) {
         tabletData.pointerType = QTabletEvent::Pen;
         dbgType = QLatin1String("pen");
+    } else if (name.contains("ugee")) {
+        isTablet = true;
+        tabletData.pointerType = QTabletEvent::Pen;
+        dbgType = QLatin1String("pen");
     } else {
         isTablet = false;
     }
diff --git a/src/plugins/platforms/xcb/qxcbdrag.cpp b/src/plugins/platforms/xcb/qxcbdrag.cpp
index aa329d8cb7..1ce947165d 100644
--- a/src/plugins/platforms/xcb/qxcbdrag.cpp
+++ b/src/plugins/platforms/xcb/qxcbdrag.cpp
@@ -202,7 +202,7 @@ void QXcbDrag::startDrag()
     if (connection()->mouseGrabber() == nullptr)
         shapedPixmapWindow()->setMouseGrabEnabled(true);
 
-    auto nativePixelPos = QHighDpi::toNativePixels(QCursor::pos(), initiatorWindow);
+    auto nativePixelPos = QHighDpi::toNativePixels(QCursor::pos(), initiatorWindow.data());
     move(nativePixelPos, QGuiApplication::mouseButtons(), QGuiApplication::keyboardModifiers());
 }