Merge remote-tracking branch 'origin/5.6' into dev

Conflicts:
	src/gui/painting/painting.pri
	src/plugins/platforms/xcb/qxcbconnection.cpp
	tests/auto/corelib/thread/qthreadstorage/qthreadstorage.pro
	tests/auto/corelib/tools/qlocale/test/test.pro
	tests/auto/gui/kernel/qwindow/tst_qwindow.cpp
	tools/configure/environment.cpp

Change-Id: I9c40f458b89b2c206de2d2c24e90b5f679c93495

24 files changed, 485 insertions, 229 deletions

diff --git a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
index ad9877eb25..4126456f90 100644
--- a/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
+++ b/src/plugins/platforminputcontexts/compose/generator/qtablegenerator.cpp
@@ -263,11 +263,11 @@ QString TableGenerator::findComposeFile()
 {
     // check if XCOMPOSEFILE points to a Compose file
     if (qEnvironmentVariableIsSet("XCOMPOSEFILE")) {
-        QString path(qgetenv("XCOMPOSEFILE"));
-        if (path.endsWith(QLatin1String("Compose")))
+        const QString path = QFile::decodeName(qgetenv("XCOMPOSEFILE"));
+        if (QFile::exists(path))
             return path;
         else
-            qWarning("Qt Warning: XCOMPOSEFILE doesn't point to a valid Compose file");
+            qWarning("$XCOMPOSEFILE doesn't point to an existing file");
     }
 
     // check if user’s home directory has a file named .XCompose
diff --git a/src/plugins/platforms/android/androidjnimain.cpp b/src/plugins/platforms/android/androidjnimain.cpp
index 2bc3b0dc7d..7045533fca 100644
--- a/src/plugins/platforms/android/androidjnimain.cpp
+++ b/src/plugins/platforms/android/androidjnimain.cpp
@@ -34,6 +34,7 @@
 
 #include <dlfcn.h>
 #include <pthread.h>
+#include <semaphore.h>
 #include <qplugin.h>
 #include <qdebug.h>
 
@@ -91,6 +92,8 @@ extern "C" typedef int (*Main)(int, char **); //use the standard main method to
 static Main m_main = nullptr;
 static void *m_mainLibraryHnd = nullptr;
 static QList<QByteArray> m_applicationParams;
+pthread_t m_qtAppThread = 0;
+static sem_t m_exitSemaphore, m_terminateSemaphore;
 
 struct SurfaceData
 {
@@ -454,6 +457,10 @@ static void *startMainMethod(void */*data*/)
     if (vm != 0)
         vm->DetachCurrentThread();
 
+    sem_post(&m_terminateSemaphore);
+    sem_wait(&m_exitSemaphore);
+    sem_destroy(&m_exitSemaphore);
+
     // We must call exit() to ensure that all global objects will be destructed
     exit(ret);
     return 0;
@@ -503,8 +510,13 @@ static jboolean startQtApplication(JNIEnv *env, jobject /*object*/, jstring para
         return false;
     }
 
-    pthread_t appThread;
-    return pthread_create(&appThread, nullptr, startMainMethod, nullptr) == 0;
+    if (sem_init(&m_exitSemaphore, 0, 0) == -1)
+        return false;
+
+    if (sem_init(&m_terminateSemaphore, 0, 0) == -1)
+        return false;
+
+    return pthread_create(&m_qtAppThread, nullptr, startMainMethod, nullptr) == 0;
 }
 
 
@@ -518,6 +530,8 @@ static void quitQtAndroidPlugin(JNIEnv *env, jclass /*clazz*/)
 
 static void terminateQt(JNIEnv *env, jclass /*clazz*/)
 {
+    sem_wait(&m_terminateSemaphore);
+    sem_destroy(&m_terminateSemaphore);
     env->DeleteGlobalRef(m_applicationClass);
     env->DeleteGlobalRef(m_classLoaderObject);
     if (m_resourcesObj)
@@ -535,6 +549,8 @@ static void terminateQt(JNIEnv *env, jclass /*clazz*/)
     m_androidPlatformIntegration = nullptr;
     delete m_androidAssetsFileEngineHandler;
     m_androidAssetsFileEngineHandler = nullptr;
+    sem_post(&m_exitSemaphore);
+    pthread_join(m_qtAppThread, nullptr);
 }
 
 static void setSurface(JNIEnv *env, jobject /*thiz*/, jint id, jobject jSurface, jint w, jint h)
diff --git a/src/plugins/platforms/android/qandroidplatformfontdatabase.cpp b/src/plugins/platforms/android/qandroidplatformfontdatabase.cpp
index 835ca8a10a..a21aac51b4 100644
--- a/src/plugins/platforms/android/qandroidplatformfontdatabase.cpp
+++ b/src/plugins/platforms/android/qandroidplatformfontdatabase.cpp
@@ -74,7 +74,7 @@ QStringList QAndroidPlatformFontDatabase::fallbacksForFamily(const QString &fami
         result.append(QString(qgetenv("QT_ANDROID_FONTS_SERIF")).split(QLatin1Char(';')));
     else
         result.append(QString(qgetenv("QT_ANDROID_FONTS")).split(QLatin1Char(';')));
-    result.append(QPlatformFontDatabase::fallbacksForFamily(family, style, styleHint, script));
+    result.append(QBasicFontDatabase::fallbacksForFamily(family, style, styleHint, script));
 
     return result;
 }
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 18abaddfd7..2d8abba189 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -502,7 +502,11 @@ void QCocoaWindow::setCocoaGeometry(const QRect &rect)
     QMacAutoReleasePool pool;
 
     if (m_contentViewIsEmbedded) {
-        QPlatformWindow::setGeometry(rect);
+        if (m_qtView) {
+            [m_qtView setFrame:NSMakeRect(0, 0, rect.width(), rect.height())];
+        } else {
+            QPlatformWindow::setGeometry(rect);
+        }
         return;
     }
 
diff --git a/src/plugins/platforms/ios/qioscontext.mm b/src/plugins/platforms/ios/qioscontext.mm
index fe0ca33c13..8bdb4bcdb3 100644
--- a/src/plugins/platforms/ios/qioscontext.mm
+++ b/src/plugins/platforms/ios/qioscontext.mm
@@ -45,12 +45,15 @@
 QIOSContext::QIOSContext(QOpenGLContext *context)
     : QPlatformOpenGLContext()
     , m_sharedContext(static_cast<QIOSContext *>(context->shareHandle()))
+    , m_eaglContext(0)
     , m_format(context->format())
 {
     m_format.setRenderableType(QSurfaceFormat::OpenGLES);
-    m_eaglContext = [[EAGLContext alloc]
-            initWithAPI:EAGLRenderingAPI(m_format.majorVersion())
-            sharegroup:m_sharedContext ? [m_sharedContext->m_eaglContext sharegroup] : nil];
+
+    EAGLSharegroup *shareGroup = m_sharedContext ? [m_sharedContext->m_eaglContext sharegroup] : nil;
+    const int preferredVersion = m_format.majorVersion() == 1 ? kEAGLRenderingAPIOpenGLES1 : kEAGLRenderingAPIOpenGLES3;
+    for (int version = preferredVersion; !m_eaglContext && version >= m_format.majorVersion(); --version)
+        m_eaglContext = [[EAGLContext alloc] initWithAPI:EAGLRenderingAPI(version) sharegroup:shareGroup];
 
     if (m_eaglContext != nil) {
         EAGLContext *originalContext = [EAGLContext currentContext];
diff --git a/src/plugins/platforms/ios/qiosmenu.mm b/src/plugins/platforms/ios/qiosmenu.mm
index f68321fb3b..5f9346816a 100644
--- a/src/plugins/platforms/ios/qiosmenu.mm
+++ b/src/plugins/platforms/ios/qiosmenu.mm
@@ -62,11 +62,23 @@ static NSString *const kSelectorPrefix = @"_qtMenuItem_";
 {
     if (self = [super init]) {
         [self setVisibleMenuItems:visibleMenuItems];
+        [[NSNotificationCenter defaultCenter]
+            addObserver:self
+            selector:@selector(menuClosed)
+            name:UIMenuControllerDidHideMenuNotification object:nil];
     }
 
     return self;
 }
 
+-(void)dealloc
+{
+    [[NSNotificationCenter defaultCenter]
+        removeObserver:self
+        name:UIMenuControllerDidHideMenuNotification object:nil];
+    [super dealloc];
+}
+
 - (void)setVisibleMenuItems:(const QIOSMenuItemList &)visibleMenuItems
 {
     m_visibleMenuItems = visibleMenuItems;
@@ -86,6 +98,11 @@ static NSString *const kSelectorPrefix = @"_qtMenuItem_";
         [[UIMenuController sharedMenuController] setMenuVisible:YES animated:NO];
 }
 
+-(void)menuClosed
+{
+    QIOSMenu::currentMenu()->dismiss();
+}
+
 - (id)targetForAction:(SEL)action withSender:(id)sender
 {
     Q_UNUSED(sender);
diff --git a/src/plugins/platforms/ios/qiostextresponder.mm b/src/plugins/platforms/ios/qiostextresponder.mm
index 9ca5e22b90..320b1cac61 100644
--- a/src/plugins/platforms/ios/qiostextresponder.mm
+++ b/src/plugins/platforms/ios/qiostextresponder.mm
@@ -318,7 +318,11 @@
     // a regular responder transfer to another window. In the former case, iOS
     // will set the new first-responder to our next-responder, and in the latter
     // case we'll have an active responder candidate.
-    if ([UIResponder currentFirstResponder] == [self nextResponder]) {
+    if (![UIResponder currentFirstResponder]) {
+        // No first responder set anymore, sync this with Qt by clearing the
+        // focus object.
+        m_inputContext->clearCurrentFocusObject();
+    } else if ([UIResponder currentFirstResponder] == [self nextResponder]) {
         // We have resigned the keyboard, and transferred first responder back to the parent view
         Q_ASSERT(!FirstResponderCandidate::currentCandidate());
         if ([self currentImeState:Qt::ImEnabled].toBool()) {
@@ -364,6 +368,32 @@
     [self sendKeyPressRelease:key modifiers:modifiers];
 }
 
+- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
+{
+    bool isEditAction = (action == @selector(cut:)
+        || action == @selector(copy:)
+        || action == @selector(paste:)
+        || action == @selector(delete:)
+        || action == @selector(toggleBoldface:)
+        || action == @selector(toggleItalics:)
+        || action == @selector(toggleUnderline:)
+        || action == @selector(undo)
+        || action == @selector(redo));
+
+    bool isSelectAction = (action == @selector(select:)
+        || action == @selector(selectAll:)
+        || action == @selector(paste:)
+        || action == @selector(undo)
+        || action == @selector(redo));
+
+    const bool unknownAction = !isEditAction && !isSelectAction;
+    const bool hasSelection = ![self selectedTextRange].empty;
+
+    if (unknownAction)
+        return [super canPerformAction:action withSender:sender];
+    return (hasSelection && isEditAction) || (!hasSelection && isSelectAction);
+}
+
 - (void)cut:(id)sender
 {
     Q_UNUSED(sender);
@@ -382,6 +412,13 @@
     [self sendShortcut:QKeySequence::Paste];
 }
 
+- (void)select:(id)sender
+{
+    Q_UNUSED(sender);
+    [self sendShortcut:QKeySequence::MoveToPreviousWord];
+    [self sendShortcut:QKeySequence::SelectNextWord];
+}
+
 - (void)selectAll:(id)sender
 {
     Q_UNUSED(sender);
@@ -580,7 +617,8 @@
 
 - (UITextPosition *)endOfDocument
 {
-    int endPosition = [self currentImeState:Qt::ImSurroundingText].toString().length();
+    QString surroundingText = [self currentImeState:Qt::ImSurroundingText].toString();
+    int endPosition = surroundingText.length() + m_markedText.length();
     return [QUITextPosition positionWithIndex:endPosition];
 }
 
@@ -611,9 +649,18 @@
 
 - (NSString *)textInRange:(UITextRange *)range
 {
+    QString text = [self currentImeState:Qt::ImSurroundingText].toString();
+    if (!m_markedText.isEmpty()) {
+        // [UITextInput textInRange] is sparsely documented, but it turns out that unconfirmed
+        // marked text should be seen as a part of the text document. This is different from
+        // ImSurroundingText, which excludes it.
+        int cursorPos = [self currentImeState:Qt::ImCursorPosition].toInt();
+        text = text.left(cursorPos) + m_markedText + text.mid(cursorPos);
+    }
+
     int s = static_cast<QUITextPosition *>([range start]).index;
     int e = static_cast<QUITextPosition *>([range end]).index;
-    return [self currentImeState:Qt::ImSurroundingText].toString().mid(s, e - s).toNSString();
+    return text.mid(s, e - s).toNSString();
 }
 
 - (void)setMarkedText:(NSString *)markedText selectedRange:(NSRange)selectedRange
@@ -882,6 +929,14 @@
     if ([text isEqualToString:@"\n"]) {
         [self sendKeyPressRelease:Qt::Key_Return modifiers:Qt::NoModifier];
 
+        // An onEnter handler of a TextInput might move to the next input by calling
+        // nextInput.forceActiveFocus() which changes the focusObject.
+        // In that case we don't want to hide the VKB.
+        if (focusObject != QGuiApplication::focusObject()) {
+            qImDebug() << "focusObject already changed, not resigning first responder.";
+            return;
+        }
+
         if (self.returnKeyType == UIReturnKeyDone || self.returnKeyType == UIReturnKeyGo
             || self.returnKeyType == UIReturnKeySend || self.returnKeyType == UIReturnKeySearch)
             [self resignFirstResponder];
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
index bd5c35037d..135c9eb601 100644
--- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp
+++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
@@ -96,7 +96,12 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
             RECT dirty = {dirtyRect.x(), dirtyRect.y(),
                 dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};
             UPDATELAYEREDWINDOWINFO info = {sizeof(info), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA, &dirty};
-            QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
+            const BOOL result = QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
+            if (!result)
+                qErrnoWarning("UpdateLayeredWindowIndirect failed for ptDst=(%d, %d),"
+                              " size=(%dx%d), dirty=(%dx%d %d, %d)", r.x(), r.y(),
+                              r.width(), r.height(), dirtyRect.width(), dirtyRect.height(),
+                              dirtyRect.x(), dirtyRect.y());
         } else {
             QWindowsContext::user32dll.updateLayeredWindow(rw->handle(), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA);
         }
diff --git a/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp b/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
index 361e7f4445..183c198806 100644
--- a/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
@@ -192,7 +192,14 @@ typedef struct {
     quint16 stringOffset;
 } NAME_RECORD;
 
-static QString fontNameFromTTFile(const QString &filename)
+typedef struct {
+    quint32 tag;
+    quint16 majorVersion;
+    quint16 minorVersion;
+    quint32 numFonts;
+} TTC_TABLE_HEADER;
+
+static QString fontNameFromTTFile(const QString &filename, int startPos = 0)
 {
     QFile f(filename);
     QString retVal;
@@ -200,6 +207,7 @@ static QString fontNameFromTTFile(const QString &filename)
     qint64 bytesToRead;
 
     if (f.open(QIODevice::ReadOnly)) {
+        f.seek(startPos);
         OFFSET_TABLE ttOffsetTable;
         bytesToRead = sizeof(OFFSET_TABLE);
         bytesRead = f.read((char*)&ttOffsetTable, bytesToRead);
@@ -280,6 +288,37 @@ static QString fontNameFromTTFile(const QString &filename)
     return retVal;
 }
 
+static QStringList fontNamesFromTTCFile(const QString &filename)
+{
+    QFile f(filename);
+    QStringList retVal;
+    qint64 bytesRead;
+    qint64 bytesToRead;
+
+    if (f.open(QIODevice::ReadOnly)) {
+        TTC_TABLE_HEADER ttcTableHeader;
+        bytesToRead = sizeof(TTC_TABLE_HEADER);
+        bytesRead = f.read((char*)&ttcTableHeader, bytesToRead);
+        if (bytesToRead != bytesRead)
+            return retVal;
+        ttcTableHeader.majorVersion = qFromBigEndian(ttcTableHeader.majorVersion);
+        ttcTableHeader.minorVersion = qFromBigEndian(ttcTableHeader.minorVersion);
+        ttcTableHeader.numFonts = qFromBigEndian(ttcTableHeader.numFonts);
+
+        if (ttcTableHeader.majorVersion < 1 || ttcTableHeader.majorVersion > 2)
+            return retVal;
+        QVarLengthArray<quint32> offsetTable(ttcTableHeader.numFonts);
+        bytesToRead = sizeof(offsetTable) * ttcTableHeader.numFonts;
+        bytesRead = f.read((char*)offsetTable.data(), bytesToRead);
+        if (bytesToRead != bytesRead)
+            return retVal;
+        f.close();
+        for (int i = 0; i < (int)ttcTableHeader.numFonts; ++i)
+            retVal << fontNameFromTTFile(filename, qFromBigEndian(offsetTable[i]));
+    }
+    return retVal;
+}
+
 static inline QString fontSettingsOrganization() { return QStringLiteral("Qt-Project"); }
 static inline QString fontSettingsApplication()  { return QStringLiteral("Qtbase"); }
 static inline QString fontSettingsGroup()        { return QStringLiteral("CEFontCache"); }
@@ -306,20 +345,28 @@ static QString findFontFile(const QString &faceName)
         //empty the cache first, as it seems that it is dirty
         settings.remove(QString());
 
-        QDirIterator it(QStringLiteral("/Windows"), QStringList(QStringLiteral("*.ttf")), QDir::Files | QDir::Hidden | QDir::System);
-
+        QDirIterator it(QStringLiteral("/Windows"), QStringList() << QStringLiteral("*.ttf") << QStringLiteral("*.ttc"), QDir::Files | QDir::Hidden | QDir::System);
+        const QLatin1Char lowerF('f');
+        const QLatin1Char upperF('F');
         while (it.hasNext()) {
             const QString fontFile = it.next();
-            const QString fontName = fontNameFromTTFile(fontFile);
-            if (fontName.isEmpty())
-                continue;
-            fontCache.insert(fontName, fontFile);
-            settings.setValue(fontName, fontFile);
-
-            if (localizedName(fontName)) {
-                QString englishFontName = getEnglishName(fontName);
-                fontCache.insert(englishFontName, fontFile);
-                settings.setValue(englishFontName, fontFile);
+            QStringList fontNames;
+            const QChar c = fontFile[fontFile.size() - 1];
+            if (c == lowerF || c == upperF)
+                fontNames << fontNameFromTTFile(fontFile);
+            else
+                fontNames << fontNamesFromTTCFile(fontFile);
+            foreach (const QString fontName, fontNames) {
+                if (fontName.isEmpty())
+                    continue;
+                fontCache.insert(fontName, fontFile);
+                settings.setValue(fontName, fontFile);
+
+                if (localizedName(fontName)) {
+                    QString englishFontName = getEnglishName(fontName);
+                    fontCache.insert(englishFontName, fontFile);
+                    settings.setValue(englishFontName, fontFile);
+                }
             }
         }
         settings.endGroup();
@@ -675,7 +722,7 @@ QStringList QWindowsFontDatabaseFT::fallbacksForFamily(const QString &family, QF
 
     result.append(QWindowsFontDatabase::extraTryFontsForFamily(family));
 
-    result.append(QPlatformFontDatabase::fallbacksForFamily(family, style, styleHint, script));
+    result.append(QBasicFontDatabase::fallbacksForFamily(family, style, styleHint, script));
 
     qCDebug(lcQpaFonts) << __FUNCTION__ << family << style << styleHint
         << script << result;
diff --git a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
index 593ac7d810..5e2e9f6454 100644
--- a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
@@ -485,9 +485,9 @@ qreal QWindowsFontEngineDirectWrite::maxCharWidth() const
     return 0;
 }
 
-QImage QWindowsFontEngineDirectWrite::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition)
+QImage QWindowsFontEngineDirectWrite::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t)
 {
-    QImage im = imageForGlyph(glyph, subPixelPosition, 0, QTransform());
+    QImage im = alphaRGBMapForGlyph(glyph, subPixelPosition, t);
 
     QImage alphaMap(im.width(), im.height(), QImage::Format_Alpha8);
 
@@ -504,6 +504,11 @@ QImage QWindowsFontEngineDirectWrite::alphaMapForGlyph(glyph_t glyph, QFixed sub
     return alphaMap;
 }
 
+QImage QWindowsFontEngineDirectWrite::alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition)
+{
+    return alphaMapForGlyph(glyph, subPixelPosition, QTransform());
+}
+
 bool QWindowsFontEngineDirectWrite::supportsSubPixelPositions() const
 {
     return true;
@@ -709,9 +714,9 @@ QString QWindowsFontEngineDirectWrite::fontNameSubstitute(const QString &familyN
 glyph_metrics_t QWindowsFontEngineDirectWrite::alphaMapBoundingBox(glyph_t glyph, QFixed pos, const QTransform &matrix, GlyphFormat format)
 {
     Q_UNUSED(pos);
-    int margin = 0;
-    if (format == QFontEngine::Format_A32 || format == QFontEngine::Format_ARGB)
-        margin = glyphMargin(QFontEngine::Format_A32);
+    Q_UNUSED(format);
+
+    int margin = glyphMargin(QFontEngine::Format_A32);
     glyph_metrics_t gm = QFontEngine::boundingBox(glyph, matrix);
     gm.width += margin * 2;
     gm.height += margin * 2;
diff --git a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
index da772469e9..cee8691d69 100644
--- a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
+++ b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
@@ -86,6 +86,7 @@ public:
     bool supportsSubPixelPositions() const;
 
     QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition);
+    QImage alphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition, const QTransform &t);
     QImage alphaRGBMapForGlyph(glyph_t t, QFixed subPixelPosition, const QTransform &xform);
 
     QFontEngine *cloneWithSize(qreal pixelSize) const;
diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index 4c0b94e6e7..c5dff60114 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -86,10 +86,15 @@ QT_BEGIN_NAMESPACE
     The code originates from \c qkeymapper_win.cpp.
 */
 
+static void clearKeyRecorderOnApplicationInActive(Qt::ApplicationState state);
+
 QWindowsKeyMapper::QWindowsKeyMapper()
     : m_useRTLExtensions(false), m_keyGrabber(0)
 {
     memset(keyLayout, 0, sizeof(keyLayout));
+    QGuiApplication *app = static_cast<QGuiApplication *>(QGuiApplication::instance());
+    QObject::connect(app, &QGuiApplication::applicationStateChanged,
+                     app, clearKeyRecorderOnApplicationInActive);
 }
 
 QWindowsKeyMapper::~QWindowsKeyMapper()
@@ -144,6 +149,12 @@ struct KeyRecorder
 };
 static KeyRecorder key_recorder;
 
+static void clearKeyRecorderOnApplicationInActive(Qt::ApplicationState state)
+{
+    if (state == Qt::ApplicationInactive)
+        key_recorder.clearKeys();
+}
+
 KeyRecord *KeyRecorder::findKey(int code, bool remove)
 {
     KeyRecord *result = 0;
diff --git a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
index 5b0f6f637e..c5c60aa882 100644
--- a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
+++ b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
@@ -245,6 +245,8 @@ QFunctionPointer QWindowsNativeInterface::platformFunction(const QByteArray &fun
 {
     if (function == QWindowsWindowFunctions::setTouchWindowTouchTypeIdentifier())
         return QFunctionPointer(QWindowsWindow::setTouchWindowTouchTypeStatic);
+    else if (function == QWindowsWindowFunctions::setHasBorderInFullScreenIdentifier())
+        return QFunctionPointer(QWindowsWindow::setHasBorderInFullScreenStatic);
     return Q_NULLPTR;
 }
 
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 611d586b19..cac8ec5ecc 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1720,7 +1720,7 @@ void QWindowsWindow::setWindowState_sys(Qt::WindowState newState)
             if (!m_savedStyle) {
                 m_savedStyle = style();
 #ifndef Q_OS_WINCE
-                if (oldState == Qt::WindowMinimized) {
+                if (oldState == Qt::WindowMinimized || oldState == Qt::WindowMaximized) {
                     const QRect nf = normalFrameGeometry(m_data.hwnd);
                     if (nf.isValid())
                         m_savedFrameGeometry = nf;
@@ -1735,6 +1735,8 @@ void QWindowsWindow::setWindowState_sys(Qt::WindowState newState)
                 newStyle |= WS_SYSMENU;
             if (visible)
                 newStyle |= WS_VISIBLE;
+            if (testFlag(HasBorderInFullScreen))
+                newStyle |= WS_BORDER;
             setStyle(newStyle);
             // Use geometry of QWindow::screen() within creation or the virtual screen the
             // window is in (QTBUG-31166, QTBUG-30724).
@@ -1769,7 +1771,7 @@ void QWindowsWindow::setWindowState_sys(Qt::WindowState newState)
             // preserve maximized state
             if (visible) {
                 setFlag(WithinMaximize);
-                ShowWindow(m_data.hwnd, (newState == Qt::WindowMaximized) ? SW_MAXIMIZE : SW_SHOWNOACTIVATE);
+                ShowWindow(m_data.hwnd, (newState == Qt::WindowMaximized) ? SW_MAXIMIZE : SW_SHOWNA);
                 clearFlag(WithinMaximize);
             }
             m_savedStyle = 0;
@@ -2371,4 +2373,19 @@ void QWindowsWindow::aboutToMakeCurrent()
 #endif
 }
 
+void QWindowsWindow::setHasBorderInFullScreenStatic(QWindow *window, bool border)
+{
+    if (!window->handle())
+        return;
+    static_cast<QWindowsWindow *>(window->handle())->setHasBorderInFullScreen(border);
+}
+
+void QWindowsWindow::setHasBorderInFullScreen(bool border)
+{
+    if (border)
+        setFlag(HasBorderInFullScreen);
+    else
+        clearFlag(HasBorderInFullScreen);
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 4172a3d850..710cab8597 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -137,7 +137,8 @@ public:
         WithinMaximize = 0x40000,
         MaximizeToFullScreen = 0x80000,
         InputMethodDisabled = 0x100000,
-        Compositing = 0x200000
+        Compositing = 0x200000,
+        HasBorderInFullScreen = 0x400000
     };
 
     QWindowsWindow(QWindow *window, const QWindowsWindowData &data);
@@ -251,7 +252,8 @@ public:
 
     static void setTouchWindowTouchTypeStatic(QWindow *window, QWindowsWindowFunctions::TouchWindowTouchTypes touchTypes);
     void registerTouchWindow(QWindowsWindowFunctions::TouchWindowTouchTypes touchTypes = QWindowsWindowFunctions::NormalTouch);
-
+    static void setHasBorderInFullScreenStatic(QWindow *window, bool border);
+    void setHasBorderInFullScreen(bool border);
 private:
     inline void show_sys() const;
     inline void hide_sys() const;
diff --git a/src/plugins/platforms/winrt/qwinrtfontdatabase.cpp b/src/plugins/platforms/winrt/qwinrtfontdatabase.cpp
index c348faf015..793256a83f 100644
--- a/src/plugins/platforms/winrt/qwinrtfontdatabase.cpp
+++ b/src/plugins/platforms/winrt/qwinrtfontdatabase.cpp
@@ -428,6 +428,21 @@ QFontEngine *QWinRTFontDatabase::fontEngine(const QFontDef &fontDef, void *handl
     return engine;
 }
 
+QStringList QWinRTFontDatabase::fallbacksForFamily(const QString &family, QFont::Style style,
+                                                   QFont::StyleHint styleHint,
+                                                   QChar::Script script) const
+{
+    Q_UNUSED(style)
+    Q_UNUSED(styleHint)
+    Q_UNUSED(script)
+
+    QStringList result;
+    if (family == QLatin1String("Helvetica"))
+        result.append(QStringLiteral("Arial"));
+    result.append(QBasicFontDatabase::fallbacksForFamily(family, style, styleHint, script));
+    return result;
+}
+
 void QWinRTFontDatabase::releaseHandle(void *handle)
 {
     if (!handle)
diff --git a/src/plugins/platforms/winrt/qwinrtfontdatabase.h b/src/plugins/platforms/winrt/qwinrtfontdatabase.h
index a88092e432..41619f5bd8 100644
--- a/src/plugins/platforms/winrt/qwinrtfontdatabase.h
+++ b/src/plugins/platforms/winrt/qwinrtfontdatabase.h
@@ -60,6 +60,8 @@ public:
     void populateFontDatabase() Q_DECL_OVERRIDE;
     void populateFamily(const QString &familyName) Q_DECL_OVERRIDE;
     QFontEngine *fontEngine(const QFontDef &fontDef, void *handle) Q_DECL_OVERRIDE;
+    QStringList fallbacksForFamily(const QString &family, QFont::Style style,
+                                   QFont::StyleHint styleHint, QChar::Script script) const Q_DECL_OVERRIDE;
     void releaseHandle(void *handle) Q_DECL_OVERRIDE;
 private:
     QHash<IDWriteFontFile *, FontDescription> m_fonts;
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index 1d20432bd4..e28d84cf92 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -179,42 +179,6 @@ QXcbScreen* QXcbConnection::findScreenForOutput(xcb_window_t rootWindow, xcb_ran
     return 0;
 }
 
-QXcbScreen* QXcbConnection::createScreen(QXcbVirtualDesktop* virtualDesktop,
-                                         xcb_randr_output_t outputId,
-                                         xcb_randr_get_output_info_reply_t *output)
-{
-    QString name;
-    if (output)
-        name = QString::fromUtf8((const char*)xcb_randr_get_output_info_name(output),
-                xcb_randr_get_output_info_name_length(output));
-    else {
-        QByteArray displayName = m_displayName;
-        int dotPos = displayName.lastIndexOf('.');
-        if (dotPos != -1)
-            displayName.truncate(dotPos);
-        name = QString::fromLocal8Bit(displayName) + QLatin1Char('.') + QString::number(virtualDesktop->number());
-    }
-
-    return new QXcbScreen(this, virtualDesktop, outputId, output, name);
-}
-
-bool QXcbConnection::checkOutputIsPrimary(xcb_window_t rootWindow, xcb_randr_output_t output)
-{
-    xcb_generic_error_t *error = 0;
-    xcb_randr_get_output_primary_cookie_t primaryCookie =
-        xcb_randr_get_output_primary(xcb_connection(), rootWindow);
-    QScopedPointer<xcb_randr_get_output_primary_reply_t, QScopedPointerPodDeleter> primary (
-        xcb_randr_get_output_primary_reply(xcb_connection(), primaryCookie, &error));
-    if (!primary || error) {
-        qWarning("failed to get the primary output of the screen");
-        free(error);
-        error = NULL;
-    }
-    const bool isPrimary = primary ? (primary->output == output) : false;
-
-    return isPrimary;
-}
-
 QXcbVirtualDesktop* QXcbConnection::virtualDesktopForRootWindow(xcb_window_t rootWindow)
 {
     foreach (QXcbVirtualDesktop *virtualDesktop, m_virtualDesktops) {
@@ -237,8 +201,9 @@ void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
             // Not for us
             return;
 
-        qCDebug(lcQpaScreen) << "QXcbConnection: XCB_RANDR_NOTIFY_CRTC_CHANGE:" << crtc.crtc;
         QXcbScreen *screen = findScreenForCrtc(crtc.window, crtc.crtc);
+        qCDebug(lcQpaScreen) << "QXcbConnection: XCB_RANDR_NOTIFY_CRTC_CHANGE:" << crtc.crtc
+                             << "mode" << crtc.mode << "relevant screen" << screen;
         // Only update geometry when there's a valid mode on the CRTC
         // CRTC with node mode could mean that output has been disabled, and we'll
         // get RRNotifyOutputChange notification for that.
@@ -260,16 +225,7 @@ void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
 
         if (screen && output.connection == XCB_RANDR_CONNECTION_DISCONNECTED) {
             qCDebug(lcQpaScreen) << "screen" << screen->name() << "has been disconnected";
-
-            // Known screen removed -> delete it
-            m_screens.removeOne(screen);
-            virtualDesktop->removeScreen(screen);
-
-            QXcbIntegration::instance()->destroyScreen(screen);
-
-            // QTBUG-40174, QTBUG-42985: If all screens are removed, wait
-            // and start rendering again later if a screen becomes available.
-
+            destroyScreen(screen);
         } else if (!screen && output.connection == XCB_RANDR_CONNECTION_CONNECTED) {
             // New XRandR output is available and it's enabled
             if (output.crtc != XCB_NONE && output.mode != XCB_NONE) {
@@ -278,59 +234,142 @@ void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
                 QScopedPointer<xcb_randr_get_output_info_reply_t, QScopedPointerPodDeleter> outputInfo(
                     xcb_randr_get_output_info_reply(xcb_connection(), outputInfoCookie, NULL));
 
-                screen = createScreen(virtualDesktop, output.output, outputInfo.data());
-                qCDebug(lcQpaScreen) << "output" << screen->name() << "is connected and enabled";
-
-                screen->setPrimary(checkOutputIsPrimary(output.window, output.output));
-                virtualDesktop->addScreen(screen);
-                m_screens << screen;
-                QXcbIntegration::instance()->screenAdded(screen, screen->isPrimary());
+                // Find a fake screen
+                foreach (QPlatformScreen *scr, virtualDesktop->screens()) {
+                    QXcbScreen *xcbScreen = (QXcbScreen *)scr;
+                    if (xcbScreen->output() == XCB_NONE) {
+                        screen = xcbScreen;
+                        break;
+                    }
+                }
 
-                // Windows which had null screens have already had expose events by now.
-                // They need to be told the screen is back, it's OK to render.
-                foreach (QWindow *window, QGuiApplication::topLevelWindows()) {
-                    QXcbWindow *xcbWin = static_cast<QXcbWindow*>(window->handle());
-                    if (xcbWin)
-                        xcbWin->maybeSetScreen(screen);
+                if (screen) {
+                    QString nameWas = screen->name();
+                    // Transform the fake screen into a physical screen
+                    screen->setOutput(output.output, outputInfo.data());
+                    updateScreen(screen, output);
+                    qCDebug(lcQpaScreen) << "output" << screen->name()
+                                         << "is connected and enabled; was fake:" << nameWas;
+                } else {
+                    screen = createScreen(virtualDesktop, output, outputInfo.data());
+                    qCDebug(lcQpaScreen) << "output" << screen->name() << "is connected and enabled";
                 }
             }
-            // else ignore disabled screens
         } else if (screen) {
-            // Screen has been disabled -> remove
             if (output.crtc == XCB_NONE && output.mode == XCB_NONE) {
+                // Screen has been disabled
                 xcb_randr_get_output_info_cookie_t outputInfoCookie =
                     xcb_randr_get_output_info(xcb_connection(), output.output, output.config_timestamp);
                 QScopedPointer<xcb_randr_get_output_info_reply_t, QScopedPointerPodDeleter> outputInfo(
                     xcb_randr_get_output_info_reply(xcb_connection(), outputInfoCookie, NULL));
                 if (outputInfo->crtc == XCB_NONE) {
                     qCDebug(lcQpaScreen) << "output" << screen->name() << "has been disabled";
-                    m_screens.removeOne(screen);
-                    virtualDesktop->removeScreen(screen);
-                    QXcbIntegration::instance()->destroyScreen(screen);
+                    destroyScreen(screen);
                 } else {
                     qCDebug(lcQpaScreen) << "output" << screen->name() << "has been temporarily disabled for the mode switch";
+                    // Reset crtc to skip RRCrtcChangeNotify events,
+                    // because they may be invalid in the middle of the mode switch
+                    screen->setCrtc(XCB_NONE);
                 }
             } else {
-                // Just update existing screen
-                screen->updateGeometry(output.config_timestamp);
-                const bool wasPrimary = screen->isPrimary();
-                screen->setPrimary(checkOutputIsPrimary(output.window, output.output));
-                if (screen->mode() != output.mode)
-                    screen->updateRefreshRate(output.mode);
-
-                // If the screen became primary, reshuffle the order in QGuiApplicationPrivate
-                if (!wasPrimary && screen->isPrimary()) {
-                    const int idx = m_screens.indexOf(screen);
-                    m_screens.swap(0, idx);
-                    QXcbIntegration::instance()->setPrimaryScreen(screen);
-                }
+                updateScreen(screen, output);
                 qCDebug(lcQpaScreen) << "output has changed" << screen;
             }
         }
+
+        qCDebug(lcQpaScreen) << "primary output is" << m_screens.first()->name();
+    }
+}
+
+bool QXcbConnection::checkOutputIsPrimary(xcb_window_t rootWindow, xcb_randr_output_t output)
+{
+    xcb_generic_error_t *error = 0;
+    xcb_randr_get_output_primary_cookie_t primaryCookie =
+        xcb_randr_get_output_primary(xcb_connection(), rootWindow);
+    QScopedPointer<xcb_randr_get_output_primary_reply_t, QScopedPointerPodDeleter> primary (
+        xcb_randr_get_output_primary_reply(xcb_connection(), primaryCookie, &error));
+    if (!primary || error) {
+        qWarning("failed to get the primary output of the screen");
+        free(error);
+        error = NULL;
+    }
+    const bool isPrimary = primary ? (primary->output == output) : false;
+
+    return isPrimary;
+}
+
+void QXcbConnection::updateScreen(QXcbScreen *screen, const xcb_randr_output_change_t &outputChange)
+{
+    screen->setCrtc(outputChange.crtc); // Set the new crtc, because it can be invalid
+    screen->updateGeometry(outputChange.config_timestamp);
+    if (screen->mode() != outputChange.mode)
+        screen->updateRefreshRate(outputChange.mode);
+    // Only screen which belongs to the primary virtual desktop can be a primary screen
+    if (screen->screenNumber() == m_primaryScreenNumber) {
+        if (!screen->isPrimary() && checkOutputIsPrimary(outputChange.window, outputChange.output)) {
+            screen->setPrimary(true);
+
+            // If the screen became primary, reshuffle the order in QGuiApplicationPrivate
+            const int idx = m_screens.indexOf(screen);
+            if (idx > 0) {
+                m_screens.first()->setPrimary(false);
+                m_screens.swap(0, idx);
+            }
+            screen->virtualDesktop()->setPrimaryScreen(screen);
+            QXcbIntegration::instance()->setPrimaryScreen(screen);
+        }
+    }
+}
+
+QXcbScreen *QXcbConnection::createScreen(QXcbVirtualDesktop *virtualDesktop,
+                                         const xcb_randr_output_change_t &outputChange,
+                                         xcb_randr_get_output_info_reply_t *outputInfo)
+{
+    QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, outputChange.output, outputInfo);
+    // Only screen which belongs to the primary virtual desktop can be a primary screen
+    if (screen->screenNumber() == m_primaryScreenNumber)
+        screen->setPrimary(checkOutputIsPrimary(outputChange.window, outputChange.output));
+
+    if (screen->isPrimary()) {
         if (!m_screens.isEmpty())
-            qCDebug(lcQpaScreen) << "primary output is" << m_screens.first()->name();
-        else
-            qCDebug(lcQpaScreen) << "no outputs";
+            m_screens.first()->setPrimary(false);
+
+        m_screens.prepend(screen);
+    } else {
+        m_screens.append(screen);
+    }
+    virtualDesktop->addScreen(screen);
+    QXcbIntegration::instance()->screenAdded(screen, screen->isPrimary());
+
+    return screen;
+}
+
+void QXcbConnection::destroyScreen(QXcbScreen *screen)
+{
+    QXcbVirtualDesktop *virtualDesktop = screen->virtualDesktop();
+    if (virtualDesktop->screens().count() == 1) {
+        // If there are no other screens on the same virtual desktop,
+        // then transform the physical screen into a fake screen.
+        const QString nameWas = screen->name();
+        screen->setOutput(XCB_NONE, Q_NULLPTR);
+        qCDebug(lcQpaScreen) << "transformed" << nameWas << "to fake" << screen;
+    } else {
+        // There is more than one screen on the same virtual desktop, remove the screen
+        m_screens.removeOne(screen);
+        virtualDesktop->removeScreen(screen);
+
+        // When primary screen is removed, set the new primary screen
+        // which belongs to the primary virtual desktop.
+        if (screen->isPrimary()) {
+            QXcbScreen *newPrimary = (QXcbScreen *)virtualDesktop->screens().at(0);
+            newPrimary->setPrimary(true);
+            const int idx = m_screens.indexOf(newPrimary);
+            if (idx > 0)
+                m_screens.swap(0, idx);
+            QXcbIntegration::instance()->setPrimaryScreen(newPrimary);
+        }
+
+        QXcbIntegration::instance()->destroyScreen(screen);
     }
 }
 
@@ -338,8 +377,7 @@ void QXcbConnection::initializeScreens()
 {
     xcb_screen_iterator_t it = xcb_setup_roots_iterator(m_setup);
     int xcbScreenNumber = 0;    // screen number in the xcb sense
-    QXcbScreen* primaryScreen = Q_NULLPTR;
-    bool hasOutputs = false;
+    QXcbScreen *primaryScreen = Q_NULLPTR;
     while (it.rem) {
         // Each "screen" in xcb terminology is a virtual desktop,
         // potentially a collection of separate juxtaposed monitors.
@@ -348,8 +386,6 @@ void QXcbConnection::initializeScreens()
         xcb_screen_t *xcbScreen = it.data;
         QXcbVirtualDesktop *virtualDesktop = new QXcbVirtualDesktop(this, xcbScreen, xcbScreenNumber);
         m_virtualDesktops.append(virtualDesktop);
-        QList<QPlatformScreen *> siblings;
-        int outputCount = 0;
         if (has_randr_extension) {
             xcb_generic_error_t *error = NULL;
             // RRGetScreenResourcesCurrent is fast but it may return nothing if the
@@ -366,7 +402,7 @@ void QXcbConnection::initializeScreens()
             } else {
                 xcb_timestamp_t timestamp;
                 xcb_randr_output_t *outputs = Q_NULLPTR;
-                outputCount = xcb_randr_get_screen_resources_current_outputs_length(resources_current.data());
+                int outputCount = xcb_randr_get_screen_resources_current_outputs_length(resources_current.data());
                 if (outputCount) {
                     timestamp = resources_current->config_timestamp;
                     outputs = xcb_randr_get_screen_resources_current_outputs(resources_current.data());
@@ -393,6 +429,7 @@ void QXcbConnection::initializeScreens()
                         qWarning("failed to get the primary output of the screen");
                         free(error);
                     } else {
+                        QList<QPlatformScreen *> siblings;
                         for (int i = 0; i < outputCount; i++) {
                             QScopedPointer<xcb_randr_get_output_info_reply_t, QScopedPointerPodDeleter> output(
                                     xcb_randr_get_output_info_reply(xcb_connection(),
@@ -416,9 +453,8 @@ void QXcbConnection::initializeScreens()
                                 continue;
                             }
 
-                            QXcbScreen *screen = createScreen(virtualDesktop, outputs[i], output.data());
+                            QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, outputs[i], output.data());
                             siblings << screen;
-                            hasOutputs = true;
                             m_screens << screen;
 
                             // There can be multiple outputs per screen, use either
@@ -435,11 +471,23 @@ void QXcbConnection::initializeScreens()
                                 }
                             }
                         }
+                        virtualDesktop->setScreens(siblings);
                     }
                 }
             }
         }
-        virtualDesktop->setScreens(siblings);
+        if (virtualDesktop->screens().isEmpty()) {
+            // If there are no XRandR outputs or XRandR extension is missing,
+            // then create a fake/legacy screen.
+            QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, XCB_NONE, Q_NULLPTR);
+            qCDebug(lcQpaScreen) << "created fake screen" << screen;
+            m_screens << screen;
+            if (m_primaryScreenNumber == xcbScreenNumber) {
+                primaryScreen = screen;
+                primaryScreen->setPrimary(true);
+            }
+            virtualDesktop->addScreen(screen);
+        }
         xcb_screen_next(&it);
         ++xcbScreenNumber;
     } // for each xcb screen
@@ -447,39 +495,25 @@ void QXcbConnection::initializeScreens()
     foreach (QXcbVirtualDesktop *virtualDesktop, m_virtualDesktops)
         virtualDesktop->subscribeToXFixesSelectionNotify();
 
-    // If there's no randr extension, or there was some error above, or we found a
-    // screen which doesn't have outputs for some other reason (e.g. on VNC or ssh -X),
-    // but the dimensions are known anyway, and we don't already have any lingering
-    // (possibly disconnected) screens, then showing windows should be possible,
-    // so create one screen. (QTBUG-31389)
-    QXcbVirtualDesktop *virtualDesktop = m_virtualDesktops.value(0);
-    if (virtualDesktop && !hasOutputs && !virtualDesktop->size().isEmpty() && m_screens.isEmpty()) {
-        QXcbScreen *screen = createScreen(virtualDesktop, 0, Q_NULLPTR);
-        virtualDesktop->setScreens(QList<QPlatformScreen *>() << screen);
-        m_screens << screen;
-        primaryScreen = screen;
-        primaryScreen->setPrimary(true);
-        qCDebug(lcQpaScreen) << "found a screen with zero outputs" << screen;
-    }
-
-    // Ensure the primary screen is first in the list
-    if (primaryScreen) {
-        Q_ASSERT(!m_screens.isEmpty());
-        if (m_screens.first() != primaryScreen) {
-            m_screens.removeOne(primaryScreen);
-            m_screens.prepend(primaryScreen);
+    if (m_virtualDesktops.isEmpty()) {
+        qFatal("QXcbConnection: no screens available");
+    } else {
+        // Ensure the primary screen is first on the list
+        if (primaryScreen) {
+            if (m_screens.first() != primaryScreen) {
+                m_screens.removeOne(primaryScreen);
+                m_screens.prepend(primaryScreen);
+            }
         }
-    }
 
-    // Push the screens to QApplication
-    QXcbIntegration *integration = QXcbIntegration::instance();
-    foreach (QXcbScreen* screen, m_screens) {
-        qCDebug(lcQpaScreen) << "adding" << screen << "(Primary:" << screen->isPrimary() << ')';
-        integration->screenAdded(screen, screen->isPrimary());
-    }
+        // Push the screens to QGuiApplication
+        foreach (QXcbScreen *screen, m_screens) {
+            qCDebug(lcQpaScreen) << "adding" << screen << "(Primary:" << screen->isPrimary() << ")";
+            QXcbIntegration::instance()->screenAdded(screen, screen->isPrimary());
+        }
 
-    if (!m_screens.isEmpty())
         qCDebug(lcQpaScreen) << "primary output is" << m_screens.first()->name();
+    }
 }
 
 QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGrabServer, xcb_visualid_t defaultVisualId, const char *displayName)
@@ -553,9 +587,6 @@ QXcbConnection::QXcbConnection(QXcbNativeInterface *nativeInterface, bool canGra
     initializeXFixes();
     initializeScreens();
 
-    if (Q_UNLIKELY(m_screens.isEmpty()))
-        qFatal("QXcbConnection: no screens available");
-
     initializeXRender();
     m_xi2Enabled = false;
 #if defined(XCB_USE_XINPUT2)
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index cf50076f98..4acca7d374 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -518,15 +518,17 @@ private:
     void initializeXShape();
     void initializeXKB();
     void handleClientMessageEvent(const xcb_client_message_event_t *event);
-    QXcbScreen* createScreen(QXcbVirtualDesktop *virtualDesktop,
-                             xcb_randr_output_t outputId = XCB_NONE,
-                             xcb_randr_get_output_info_reply_t *output = 0);
     QXcbScreen* findScreenForCrtc(xcb_window_t rootWindow, xcb_randr_crtc_t crtc);
     QXcbScreen* findScreenForOutput(xcb_window_t rootWindow, xcb_randr_output_t output);
     QXcbVirtualDesktop* virtualDesktopForRootWindow(xcb_window_t rootWindow);
+    void updateScreens(const xcb_randr_notify_event_t *event);
     bool checkOutputIsPrimary(xcb_window_t rootWindow, xcb_randr_output_t output);
+    void updateScreen(QXcbScreen *screen, const xcb_randr_output_change_t &outputChange);
+    QXcbScreen *createScreen(QXcbVirtualDesktop *virtualDesktop,
+                             const xcb_randr_output_change_t &outputChange,
+                             xcb_randr_get_output_info_reply_t *outputInfo);
+    void destroyScreen(QXcbScreen *screen);
     void initializeScreens();
-    void updateScreens(const xcb_randr_notify_event_t *event);
     bool compressEvent(xcb_generic_event_t *event, int currentIndex, QXcbEventArray *eventqueue) const;
 
     bool m_xi2Enabled;
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index 8097cce709..1a123703a5 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -406,6 +406,9 @@ XInput2TouchDeviceData *QXcbConnection::touchDeviceForId(int id)
 #endif // XCB_USE_XINPUT22
             case XIValuatorClass: {
                 XIValuatorClassInfo *vci = reinterpret_cast<XIValuatorClassInfo *>(classinfo);
+                // Some devices (mice) report a resolution of 0; they will be excluded later,
+                // for now just prevent a division by zero
+                const int vciResolution = vci->resolution ? vci->resolution : 1;
                 if (vci->label == atom(QXcbAtom::AbsMTPositionX))
                     caps |= QTouchDevice::Position | QTouchDevice::NormalizedPosition;
                 else if (vci->label == atom(QXcbAtom::AbsMTTouchMajor))
@@ -414,16 +417,16 @@ XInput2TouchDeviceData *QXcbConnection::touchDeviceForId(int id)
                     caps |= QTouchDevice::Pressure;
                 else if (vci->label == atom(QXcbAtom::RelX)) {
                     hasRelativeCoords = true;
-                    dev->size.setWidth((vci->max - vci->min) * 1000.0 / vci->resolution);
+                    dev->size.setWidth((vci->max - vci->min) * 1000.0 / vciResolution);
                 } else if (vci->label == atom(QXcbAtom::RelY)) {
                     hasRelativeCoords = true;
-                    dev->size.setHeight((vci->max - vci->min) * 1000.0 / vci->resolution);
+                    dev->size.setHeight((vci->max - vci->min) * 1000.0 / vciResolution);
                 } else if (vci->label == atom(QXcbAtom::AbsX)) {
                     caps |= QTouchDevice::Position;
-                    dev->size.setHeight((vci->max - vci->min) * 1000.0 / vci->resolution);
+                    dev->size.setHeight((vci->max - vci->min) * 1000.0 / vciResolution);
                 } else if (vci->label == atom(QXcbAtom::AbsY)) {
                     caps |= QTouchDevice::Position;
-                    dev->size.setWidth((vci->max - vci->min) * 1000.0 / vci->resolution);
+                    dev->size.setWidth((vci->max - vci->min) * 1000.0 / vciResolution);
                 }
                 break;
             }
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp
index db7d837e01..9b1b9fcbb0 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -81,6 +81,13 @@ void QXcbVirtualDesktop::addScreen(QPlatformScreen *s)
     ((QXcbScreen *) s)->isPrimary() ? m_screens.prepend(s) : m_screens.append(s);
 }
 
+void QXcbVirtualDesktop::setPrimaryScreen(QPlatformScreen *s)
+{
+    const int idx = m_screens.indexOf(s);
+    Q_ASSERT(idx > -1);
+    m_screens.swap(0, idx);
+}
+
 QXcbXSettings *QXcbVirtualDesktop::xSettings() const
 {
     if (!m_xSettings) {
@@ -149,16 +156,15 @@ void QXcbVirtualDesktop::updateWorkArea()
 }
 
 QXcbScreen::QXcbScreen(QXcbConnection *connection, QXcbVirtualDesktop *virtualDesktop,
-                       xcb_randr_output_t outputId, xcb_randr_get_output_info_reply_t *output,
-                       QString outputName)
+                       xcb_randr_output_t outputId, xcb_randr_get_output_info_reply_t *output)
     : QXcbObject(connection)
     , m_virtualDesktop(virtualDesktop)
     , m_output(outputId)
-    , m_crtc(output ? output->crtc : 0)
+    , m_crtc(output ? output->crtc : XCB_NONE)
     , m_mode(XCB_NONE)
     , m_primary(false)
     , m_rotation(XCB_RANDR_ROTATION_ROTATE_0)
-    , m_outputName(outputName)
+    , m_outputName(getOutputName(output))
     , m_outputSizeMillimeters(output ? QSize(output->mm_width, output->mm_height) : QSize())
     , m_virtualSize(virtualDesktop->size())
     , m_virtualSizeMillimeters(virtualDesktop->physicalSize())
@@ -266,6 +272,22 @@ QXcbScreen::~QXcbScreen()
     delete m_cursor;
 }
 
+QString QXcbScreen::getOutputName(xcb_randr_get_output_info_reply_t *outputInfo)
+{
+    QString name;
+    if (outputInfo) {
+        name = QString::fromUtf8((const char*)xcb_randr_get_output_info_name(outputInfo),
+                                 xcb_randr_get_output_info_name_length(outputInfo));
+    } else {
+        QByteArray displayName = connection()->displayName();
+        int dotPos = displayName.lastIndexOf('.');
+        if (dotPos != -1)
+            displayName.truncate(dotPos);
+        name = QString::fromLocal8Bit(displayName) + QLatin1Char('.')
+                + QString::number(m_virtualDesktop->number());
+    }
+    return name;
+}
 
 QWindow *QXcbScreen::topLevelAt(const QPoint &p) const
 {
@@ -390,6 +412,16 @@ QPlatformCursor *QXcbScreen::cursor() const
     return m_cursor;
 }
 
+void QXcbScreen::setOutput(xcb_randr_output_t outputId,
+                           xcb_randr_get_output_info_reply_t *outputInfo)
+{
+    m_output = outputId;
+    m_crtc = outputInfo ? outputInfo->crtc : XCB_NONE;
+    m_mode = XCB_NONE;
+    m_outputName = getOutputName(outputInfo);
+    // TODO: Send an event to the QScreen instance that the screen changed its name
+}
+
 /*!
     \brief handle the XCB screen change event and update properties
 
@@ -458,19 +490,10 @@ void QXcbScreen::handleScreenChange(xcb_randr_screen_change_notify_event_t *chan
 
     updateGeometry(change_event->timestamp);
 
-    QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), geometry(), availableGeometry());
     QWindowSystemInterface::handleScreenOrientationChange(QPlatformScreen::screen(), m_orientation);
 
     QDpi ldpi = logicalDpi();
     QWindowSystemInterface::handleScreenLogicalDotsPerInchChange(QPlatformScreen::screen(), ldpi.first, ldpi.second);
-
-    // Windows which had null screens have already had expose events by now.
-    // They need to be told the screen is back, it's OK to render.
-    foreach (QWindow *window, QGuiApplication::topLevelWindows()) {
-        QXcbWindow *xcbWin = static_cast<QXcbWindow*>(window->handle());
-        if (xcbWin)
-            xcbWin->maybeSetScreen(this);
-    }
 }
 
 void QXcbScreen::updateGeometry(xcb_timestamp_t timestamp)
diff --git a/src/plugins/platforms/xcb/qxcbscreen.h b/src/plugins/platforms/xcb/qxcbscreen.h
index c68c290791..79620f40ec 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.h
+++ b/src/plugins/platforms/xcb/qxcbscreen.h
@@ -72,6 +72,7 @@ public:
     void setScreens(QList<QPlatformScreen *> sl) { m_screens = sl; }
     void removeScreen(QPlatformScreen *s) { m_screens.removeOne(s); }
     void addScreen(QPlatformScreen *s);
+    void setPrimaryScreen(QPlatformScreen *s);
 
     QXcbXSettings *xSettings() const;
 
@@ -101,10 +102,11 @@ class Q_XCB_EXPORT QXcbScreen : public QXcbObject, public QPlatformScreen
 {
 public:
     QXcbScreen(QXcbConnection *connection, QXcbVirtualDesktop *virtualDesktop,
-               xcb_randr_output_t outputId, xcb_randr_get_output_info_reply_t *output,
-               QString outputName);
+               xcb_randr_output_t outputId, xcb_randr_get_output_info_reply_t *outputInfo);
     ~QXcbScreen();
 
+    QString getOutputName(xcb_randr_get_output_info_reply_t *outputInfo);
+
     QPixmap grabWindow(WId window, int x, int y, int width, int height) const Q_DECL_OVERRIDE;
 
     QWindow *topLevelAt(const QPoint &point) const Q_DECL_OVERRIDE;
@@ -137,6 +139,10 @@ public:
     xcb_randr_crtc_t crtc() const { return m_crtc; }
     xcb_randr_mode_t mode() const { return m_mode; }
 
+    void setOutput(xcb_randr_output_t outputId,
+                   xcb_randr_get_output_info_reply_t *outputInfo);
+    void setCrtc(xcb_randr_crtc_t crtc) { m_crtc = crtc; }
+
     void windowShown(QXcbWindow *window);
     QString windowManagerName() const { return m_windowManagerName; }
     bool syncRequestSupported() const { return m_syncRequestSupported; }
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 3e01a90402..ae81674eca 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -143,7 +143,7 @@ const quint32 XEMBED_VERSION = 0;
 
 QXcbScreen *QXcbWindow::parentScreen()
 {
-    return parent() ? static_cast<QXcbWindow*>(parent())->parentScreen() : m_xcbScreen;
+    return parent() ? static_cast<QXcbWindow*>(parent())->parentScreen() : xcbScreen();
 }
 
 // Returns \c true if we should set WM_TRANSIENT_FOR on \a w
@@ -266,7 +266,6 @@ static const char *wm_window_type_property_id = "_q_xcb_wm_window_type";
 QXcbWindow::QXcbWindow(QWindow *window)
     : QPlatformWindow(window)
     , m_window(0)
-    , m_xcbScreen(0)
     , m_syncCounter(0)
     , m_gravity(XCB_GRAVITY_STATIC)
     , m_mapped(false)
@@ -322,7 +321,6 @@ void QXcbWindow::create()
     QRect rect = windowGeometry();
     QXcbScreen *platformScreen = parent() ? parentScreen() : static_cast<QXcbScreen*>(screenForGeometry(rect));
 
-    m_xcbScreen = platformScreen;
     if (type == Qt::Desktop) {
         m_window = platformScreen->root();
         m_depth = platformScreen->screen()->root_depth;
@@ -624,27 +622,18 @@ void QXcbWindow::destroy()
         m_pendingSyncRequest->invalidate();
 }
 
-void QXcbWindow::maybeSetScreen(QXcbScreen *screen)
-{
-    if (!window()->screen() && screen->geometry().contains(geometry().topLeft())) {
-        QWindowSystemInterface::handleWindowScreenChanged(window(), static_cast<QPlatformScreen *>(screen)->screen());
-        QWindowSystemInterface::handleExposeEvent(window(), QRegion(QRect(QPoint(0, 0), window()->size())));
-    }
-}
-
 void QXcbWindow::setGeometry(const QRect &rect)
 {
     QPlatformWindow::setGeometry(rect);
 
     propagateSizeHints();
 
-    QXcbScreen *currentScreen = m_xcbScreen;
+    QXcbScreen *currentScreen = xcbScreen();
     QXcbScreen *newScreen = parent() ? parentScreen() : static_cast<QXcbScreen*>(screenForGeometry(rect));
 
     if (!newScreen)
         newScreen = xcbScreen();
 
-    m_xcbScreen = newScreen;
     const QRect wmGeometry = windowToWmGeometry(rect);
 
     if (newScreen && newScreen != currentScreen)
@@ -848,15 +837,13 @@ void QXcbWindow::hide()
     Q_XCB_CALL(xcb_unmap_window(xcb_connection(), m_window));
 
     // send synthetic UnmapNotify event according to icccm 4.1.4
-    if (xcbScreen()) {
-        xcb_unmap_notify_event_t event;
-        event.response_type = XCB_UNMAP_NOTIFY;
-        event.event = xcbScreen()->root();
-        event.window = m_window;
-        event.from_configure = false;
-        Q_XCB_CALL(xcb_send_event(xcb_connection(), false, xcbScreen()->root(),
-                                  XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
-    }
+    xcb_unmap_notify_event_t event;
+    event.response_type = XCB_UNMAP_NOTIFY;
+    event.event = xcbScreen()->root();
+    event.window = m_window;
+    event.from_configure = false;
+    Q_XCB_CALL(xcb_send_event(xcb_connection(), false, xcbScreen()->root(),
+                              XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
 
     xcb_flush(xcb_connection());
 
@@ -1185,8 +1172,6 @@ void QXcbWindow::changeNetWmState(bool set, xcb_atom_t one, xcb_atom_t two)
     event.data.data32[3] = 0;
     event.data.data32[4] = 0;
 
-    if (!xcbScreen())
-        return;
     Q_XCB_CALL(xcb_send_event(xcb_connection(), 0, xcbScreen()->root(), XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT, (const char *)&event));
 }
 
@@ -1448,8 +1433,6 @@ void QXcbWindow::setParent(const QPlatformWindow *parent)
         xcb_parent_id = qXcbParent->xcb_window();
         m_embedded = qXcbParent->window()->type() == Qt::ForeignWindow;
     } else {
-        if (!xcbScreen())
-            return;
         xcb_parent_id = xcbScreen()->root();
         m_embedded = false;
     }
@@ -2005,7 +1988,7 @@ void QXcbWindow::handleConfigureNotifyEvent(const xcb_configure_notify_event_t *
 {
     bool fromSendEvent = (event->response_type & 0x80);
     QPoint pos(event->x, event->y);
-    if (!parent() && !fromSendEvent && xcbScreen()) {
+    if (!parent() && !fromSendEvent) {
         // Do not trust the position, query it instead.
         xcb_translate_coordinates_cookie_t cookie = xcb_translate_coordinates(xcb_connection(), xcb_window(),
                                                                               xcbScreen()->root(), 0, 0);
@@ -2017,21 +2000,38 @@ void QXcbWindow::handleConfigureNotifyEvent(const xcb_configure_notify_event_t *
         }
     }
 
-    const QRect rect = QRect(pos, QSize(event->width, event->height));
-    QPlatformScreen *newScreen = parent() ? parent()->screen() : screenForGeometry(rect);
+    // The original geometry requested by setGeometry() might be different
+    // from what we end up with after applying window constraints.
+    QRect requestedGeometry = geometry();
 
-    QXcbScreen *currentScreen = m_xcbScreen;
-    m_xcbScreen = static_cast<QXcbScreen*>(newScreen);
+    const QRect actualGeometry = QRect(pos, QSize(event->width, event->height));
+    QPlatformScreen *newScreen = parent() ? parent()->screen() : screenForGeometry(actualGeometry);
     if (!newScreen)
         return;
 
-    QPlatformWindow::setGeometry(rect);
-    QWindowSystemInterface::handleGeometryChange(window(), rect);
-    if (newScreen != currentScreen)
-        QWindowSystemInterface::handleWindowScreenChanged(window(), newScreen->screen());
+    // Persist the actual geometry so that QWindow::geometry() can
+    // be queried in the resize event.
+    QPlatformWindow::setGeometry(actualGeometry);
 
-    if (m_mapped)
-        QWindowSystemInterface::handleExposeEvent(window(), QRect(QPoint(), geometry().size()));
+    // FIXME: In the case of the requestedGeometry not matching the actualGeometry due
+    // to e.g. the window manager applying restrictions to the geometry, the application
+    // will never see a move/resize event if the actualGeometry is the same as the current
+    // geometry, and may think the requested geometry was fulfilled.
+    QWindowSystemInterface::handleGeometryChange(window(), actualGeometry);
+
+    // QPlatformScreen::screen() is updated asynchronously, so we can't compare it
+    // with the newScreen. Just send the WindowScreenChanged event and QGuiApplication
+    // will make the comparison later.
+    QWindowSystemInterface::handleWindowScreenChanged(window(), newScreen->screen());
+
+    // For expose events we have no way of telling QGuiApplication to used the locally
+    // cached version of the previous state, so we may in some situations end up with
+    // an additional expose event.
+    QRect previousGeometry = requestedGeometry != actualGeometry ?
+        requestedGeometry : qt_window_private(window())->geometry;
+
+    if (m_mapped && actualGeometry.size() != previousGeometry.size())
+        QWindowSystemInterface::handleExposeEvent(window(), QRect(QPoint(), actualGeometry.size()));
 
     if (m_usingSyncProtocol && m_syncState == SyncReceived)
         m_syncState = SyncAndConfigureReceived;
@@ -2298,8 +2298,6 @@ void QXcbWindow::handleEnterNotifyEvent(const xcb_enter_notify_event_t *event)
         return;
 
     const QPoint local(event->event_x, event->event_y);
-    if (!xcbScreen())
-        return;
     QPoint global = QPoint(event->root_x, event->root_y);
     QWindowSystemInterface::handleEnterEvent(window(), local, global);
 }
@@ -2317,8 +2315,6 @@ void QXcbWindow::handleLeaveNotifyEvent(const xcb_leave_notify_event_t *event)
 
     if (enterWindow) {
         QPoint local(enter->event_x, enter->event_y);
-        if (!xcbScreen())
-            return;
         QPoint global = QPoint(event->root_x, event->root_y);
 
         QWindowSystemInterface::handleEnterLeaveEvent(enterWindow->window(), window(), local, global);
@@ -2334,8 +2330,6 @@ void QXcbWindow::handlePropertyNotifyEvent(const xcb_property_notify_event_t *ev
     connection()->setTime(event->time);
 
     const bool propertyDeleted = event->state == XCB_PROPERTY_DELETE;
-    if (!xcbScreen())
-        return;
 
     if (event->atom == atom(QXcbAtom::_NET_WM_STATE) || event->atom == atom(QXcbAtom::WM_STATE)) {
         if (propertyDeleted)
@@ -2655,8 +2649,6 @@ bool QXcbWindow::needsSync() const
 
 void QXcbWindow::postSyncWindowRequest()
 {
-    if (!xcbScreen())
-        return;
     if (!m_pendingSyncRequest) {
         QXcbSyncWindowRequest *e = new QXcbSyncWindowRequest(this);
         m_pendingSyncRequest = e;
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index c42c98c205..587be22915 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -167,7 +167,6 @@ public:
 
     virtual void create();
     virtual void destroy();
-    void maybeSetScreen(QXcbScreen *screen);
     QXcbScreen *screenForNativeGeometry(const QRect &newGeometry) const;
 
 public Q_SLOTS:
@@ -215,8 +214,6 @@ protected:
 
     xcb_window_t m_window;
 
-    QXcbScreen *m_xcbScreen;
-
     uint m_depth;
     QImage::Format m_imageFormat;
     bool m_imageRgbSwap;