20 files changed, 284 insertions, 327 deletions

diff --git a/src/widgets/kernel/qactiongroup.cpp b/src/widgets/kernel/qactiongroup.cpp
index 7934ae1d90..4786437d7e 100644
--- a/src/widgets/kernel/qactiongroup.cpp
+++ b/src/widgets/kernel/qactiongroup.cpp
@@ -316,8 +316,8 @@ bool QActionGroup::isEnabled() const
 }
 
 /*!
-  Returns the currently checked action in the group, or 0 if none
-  are checked.
+  Returns the currently checked action in the group, or \nullptr if
+  none are checked.
 */
 QAction *QActionGroup::checkedAction() const
 {
diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index ebab87b193..7c44bfe39d 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -784,7 +784,7 @@ QWidget *QApplication::activeModalWidget()
 
 /*!
     Cleans up any window system resources that were allocated by this
-    application. Sets the global variable \c qApp to 0.
+    application. Sets the global variable \c qApp to \nullptr.
 */
 
 QApplication::~QApplication()
@@ -893,8 +893,8 @@ void qt_cleanup()
 /*!
     \fn QWidget *QApplication::widgetAt(const QPoint &point)
 
-    Returns the widget at global screen position \a point, or 0 if there is no
-    Qt widget there.
+    Returns the widget at global screen position \a point, or \nullptr
+    if there is no Qt widget there.
 
     This function can be slow.
 
@@ -904,9 +904,9 @@ QWidget *QApplication::widgetAt(const QPoint &p)
 {
     QWidget *window = QApplication::topLevelAt(p);
     if (!window)
-        return 0;
+        return nullptr;
 
-    QWidget *child = 0;
+    QWidget *child = nullptr;
 
     if (!window->testAttribute(Qt::WA_TransparentForMouseEvents))
         child = window->childAt(window->mapFromGlobal(p));
@@ -942,8 +942,8 @@ QWidget *QApplication::widgetAt(const QPoint &p)
 
     \overload
 
-    Returns the widget at global screen position (\a x, \a y), or 0 if there is
-    no Qt widget there.
+    Returns the widget at global screen position (\a x, \a y), or
+    \nullptr if there is no Qt widget there.
 */
 
 /*!
@@ -1243,6 +1243,7 @@ QStyle* QApplication::setStyle(const QString& style)
     return s;
 }
 
+#if QT_DEPRECATED_SINCE(5, 8)
 /*!
     Returns the color specification.
     \obsolete
@@ -1317,6 +1318,7 @@ void QApplication::setColorSpec(int spec)
 {
     Q_UNUSED(spec)
 }
+#endif
 
 /*!
     \property QApplication::globalStrut
@@ -1428,6 +1430,7 @@ void QApplicationPrivate::setPalette_helper(const QPalette &palette, const char*
         else
             *QApplicationPrivate::set_pal = palette;
         QCoreApplication::setAttribute(Qt::AA_SetPalette);
+        emit qGuiApp->paletteChanged(*QGuiApplicationPrivate::app_pal);
     }
 }
 
@@ -1727,8 +1730,8 @@ QWidgetList QApplication::allWidgets()
 }
 
 /*!
-    Returns the application widget that has the keyboard input focus, or 0 if
-    no widget in this application has the focus.
+    Returns the application widget that has the keyboard input focus,
+    or \nullptr if no widget in this application has the focus.
 
     \sa QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), focusChanged()
 */
@@ -1796,7 +1799,7 @@ void QApplicationPrivate::setFocusWidget(QWidget *focus, Qt::FocusReason reason)
 
 /*!
     Returns the application top-level window that has the keyboard input focus,
-    or 0 if no application window has the focus. There might be an
+    or \nullptr if no application window has the focus. There might be an
     activeWindow() even if there is no focusWidget(), for example if no widget
     in that window accepts key events.
 
@@ -3891,6 +3894,7 @@ Qt::NavigationMode QApplication::navigationMode()
     return QApplicationPrivate::navigationMode;
 }
 
+# if QT_DEPRECATED_SINCE(5, 13)
 /*!
     Sets whether Qt should use focus navigation suitable for use with a
     minimal keypad.
@@ -3933,6 +3937,7 @@ bool QApplication::keypadNavigationEnabled()
     return QApplicationPrivate::navigationMode == Qt::NavigationModeKeypadTabOrder ||
         QApplicationPrivate::navigationMode == Qt::NavigationModeKeypadDirectional;
 }
+# endif
 #endif
 
 /*!
diff --git a/src/widgets/kernel/qapplication.h b/src/widgets/kernel/qapplication.h
index 7a5d7ba1a9..27e743a28d 100644
--- a/src/widgets/kernel/qapplication.h
+++ b/src/widgets/kernel/qapplication.h
@@ -180,8 +180,12 @@ public:
     bool notify(QObject *, QEvent *) override;
 
 #ifdef QT_KEYPAD_NAVIGATION
-    static Q_DECL_DEPRECATED void setKeypadNavigationEnabled(bool);
-    static bool keypadNavigationEnabled();
+# if QT_DEPRECATED_SINCE(5, 13)
+    static QT_DEPRECATED_X ("Use QApplication::setNavigationMode() instead")
+    void setKeypadNavigationEnabled(bool);
+    static QT_DEPRECATED_X ("Use QApplication::navigationMode() instead")
+    bool keypadNavigationEnabled();
+# endif
     static void setNavigationMode(Qt::NavigationMode mode);
     static Qt::NavigationMode navigationMode();
 #endif
diff --git a/src/widgets/kernel/qdesktopwidget.cpp b/src/widgets/kernel/qdesktopwidget.cpp
index 5fb7882932..d17c7eb36c 100644
--- a/src/widgets/kernel/qdesktopwidget.cpp
+++ b/src/widgets/kernel/qdesktopwidget.cpp
@@ -176,26 +176,32 @@ void QDesktopWidgetPrivate::_q_updateScreens()
         // Notice that we trigger screenCountChanged even if a screen was removed and another one added,
         // in which case the total number of screens did not change. This is the only way for applications
         // to notice that a screen was swapped out against another one.
+#if QT_DEPRECATED_SINCE(5, 11)
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_DEPRECATED
         emit q->screenCountChanged(targetLength);
 QT_WARNING_POP
+#endif
     }
+#if QT_DEPRECATED_SINCE(5, 11)
     foreach (int changedScreen, changedScreens)
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_DEPRECATED
         emit q->resized(changedScreen);
 QT_WARNING_POP
+#endif
 }
 
 void QDesktopWidgetPrivate::_q_availableGeometryChanged()
 {
+#if QT_DEPRECATED_SINCE(5, 11)
     Q_Q(QDesktopWidget);
     if (QScreen *screen = qobject_cast<QScreen *>(q->sender()))
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_DEPRECATED
         emit q->workAreaResized(QGuiApplication::screens().indexOf(screen));
 QT_WARNING_POP
+#endif
 }
 
 QDesktopWidget::QDesktopWidget()
@@ -212,10 +218,12 @@ QDesktopWidget::~QDesktopWidget()
 {
 }
 
+#if QT_DEPRECATED_SINCE(5, 11)
 bool QDesktopWidget::isVirtualDesktop() const
 {
     return QDesktopWidgetPrivate::isVirtualDesktop();
 }
+#endif
 
 bool QDesktopWidgetPrivate::isVirtualDesktop()
 {
@@ -242,24 +250,27 @@ int QDesktopWidgetPrivate::height()
     return geometry().height();
 }
 
+#if QT_DEPRECATED_SINCE(5, 11)
 int QDesktopWidget::primaryScreen() const
 {
     return QDesktopWidgetPrivate::primaryScreen();
 }
+#endif
 
 int QDesktopWidgetPrivate::primaryScreen()
 {
     return 0;
 }
 
-int QDesktopWidget::numScreens() const
+int QDesktopWidgetPrivate::numScreens()
 {
-    return QDesktopWidgetPrivate::numScreens();
+    return qMax(QGuiApplication::screens().size(), 1);
 }
 
-int QDesktopWidgetPrivate::numScreens()
+#if QT_DEPRECATED_SINCE(5, 11)
+int QDesktopWidget::numScreens() const
 {
-    return qMax(QGuiApplication::screens().size(), 1);
+    return QDesktopWidgetPrivate::numScreens();
 }
 
 QWidget *QDesktopWidget::screen(int screen)
@@ -274,6 +285,7 @@ const QRect QDesktopWidget::availableGeometry(int screenNo) const
 {
     return QDesktopWidgetPrivate::availableGeometry(screenNo);
 }
+#endif
 
 const QRect QDesktopWidgetPrivate::availableGeometry(int screenNo)
 {
@@ -281,10 +293,12 @@ const QRect QDesktopWidgetPrivate::availableGeometry(int screenNo)
     return screen ? screen->availableGeometry() : QRect();
 }
 
+#if QT_DEPRECATED_SINCE(5, 11)
 const QRect QDesktopWidget::screenGeometry(int screenNo) const
 {
     return QDesktopWidgetPrivate::screenGeometry(screenNo);
 }
+#endif
 
 const QRect QDesktopWidgetPrivate::screenGeometry(int screenNo)
 {
@@ -344,10 +358,12 @@ int QDesktopWidgetPrivate::screenNumber(const QWidget *w)
     return allScreens.indexOf(widgetScreen);
 }
 
+#if QT_DEPRECATED_SINCE(5, 11)
 int QDesktopWidget::screenNumber(const QPoint &p) const
 {
     return QDesktopWidgetPrivate::screenNumber(p);
 }
+#endif
 
 int QDesktopWidgetPrivate::screenNumber(const QPoint &p)
 {
diff --git a/src/widgets/kernel/qdesktopwidget.h b/src/widgets/kernel/qdesktopwidget.h
index f986f0db20..e5c587984f 100644
--- a/src/widgets/kernel/qdesktopwidget.h
+++ b/src/widgets/kernel/qdesktopwidget.h
@@ -52,9 +52,11 @@ class QDesktopWidgetPrivate;
 class Q_WIDGETS_EXPORT QDesktopWidget : public QWidget
 {
     Q_OBJECT
+#if QT_DEPRECATED_SINCE(5, 11)
     Q_PROPERTY(bool virtualDesktop READ isVirtualDesktop)
     Q_PROPERTY(int screenCount READ screenCount NOTIFY screenCountChanged)
     Q_PROPERTY(int primaryScreen READ primaryScreen NOTIFY primaryScreenChanged)
+#endif
 public:
     QDesktopWidget();
     ~QDesktopWidget();
diff --git a/src/widgets/kernel/qformlayout.cpp b/src/widgets/kernel/qformlayout.cpp
index 600934b8a1..bd0ea2598a 100644
--- a/src/widgets/kernel/qformlayout.cpp
+++ b/src/widgets/kernel/qformlayout.cpp
@@ -419,13 +419,15 @@ void QFormLayoutPrivate::updateSizes()
             if (label) {
                 maxMinLblWidth = qMax(maxMinLblWidth, label->minSize.width());
                 maxShLblWidth = qMax(maxShLblWidth, label->sizeHint.width());
-                if (field) {
+            }
+            if (field) {
+                if (field->fullRow) {
+                    maxMinIfldWidth = qMax(maxMinIfldWidth, field->minSize.width());
+                    maxShIfldWidth = qMax(maxShIfldWidth, field->sizeHint.width());
+                } else {
                     maxMinFldWidth = qMax(maxMinFldWidth, field->minSize.width() + field->sbsHSpace);
                     maxShFldWidth = qMax(maxShFldWidth, field->sizeHint.width() + field->sbsHSpace);
                 }
-            } else if (field) {
-                maxMinIfldWidth = qMax(maxMinIfldWidth, field->minSize.width());
-                maxShIfldWidth = qMax(maxShIfldWidth, field->sizeHint.width());
             }
 
             prevLbl = label;
@@ -2207,8 +2209,11 @@ void QFormLayoutPrivate::arrangeWidgets(const QVector<QLayoutStruct>& layouts, Q
 
             QSize sz(qMin(label->layoutWidth, label->sizeHint.width()), height);
             int x = leftOffset + rect.x() + label->layoutPos;
-            if (fixedAlignment(q->labelAlignment(), layoutDirection) & Qt::AlignRight)
+            const auto fAlign = fixedAlignment(q->labelAlignment(), layoutDirection);
+            if (fAlign & Qt::AlignRight)
                 x += label->layoutWidth - sz.width();
+            else if (fAlign & Qt::AlignHCenter)
+                x += label->layoutWidth / 2 - sz.width() / 2;
             QPoint p(x, layouts.at(label->vLayoutIndex).pos);
             // ### expansion & sizepolicy stuff
 
diff --git a/src/widgets/kernel/qgesturemanager.cpp b/src/widgets/kernel/qgesturemanager.cpp
index 891858b035..cd27c9c5be 100644
--- a/src/widgets/kernel/qgesturemanager.cpp
+++ b/src/widgets/kernel/qgesturemanager.cpp
@@ -136,7 +136,7 @@ Qt::GestureType QGestureManager::registerGestureRecognizer(QGestureRecognizer *r
         ++m_lastCustomGestureId;
         type = Qt::GestureType(m_lastCustomGestureId);
     }
-    m_recognizers.insertMulti(type, recognizer);
+    m_recognizers.insert(type, recognizer);
     return type;
 }
 
@@ -517,7 +517,7 @@ bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
         for(ContextIterator it = w->d_func()->gestureContext.constBegin(),
             e = w->d_func()->gestureContext.constEnd(); it != e; ++it) {
             types.insert(it.key(), 0);
-            contexts.insertMulti(w, it.key());
+            contexts.insert(w, it.key());
         }
     }
     // find all gesture contexts for the widget tree
@@ -529,7 +529,7 @@ bool QGestureManager::filterEvent(QWidget *receiver, QEvent *event)
             if (!(it.value() & Qt::DontStartGestureOnChildren)) {
                 if (!types.contains(it.key())) {
                     types.insert(it.key(), 0);
-                    contexts.insertMulti(w, it.key());
+                    contexts.insert(w, it.key());
                 }
             }
         }
@@ -551,7 +551,7 @@ bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event)
         for(ContextIterator it = item->QGraphicsItem::d_func()->gestureContext.constBegin(),
             e = item->QGraphicsItem::d_func()->gestureContext.constEnd(); it != e; ++it) {
             types.insert(it.key(), 0);
-            contexts.insertMulti(item, it.key());
+            contexts.insert(item, it.key());
         }
     }
     // find all gesture contexts for the graphics object tree
@@ -564,7 +564,7 @@ bool QGestureManager::filterEvent(QGraphicsObject *receiver, QEvent *event)
             if (!(it.value() & Qt::DontStartGestureOnChildren)) {
                 if (!types.contains(it.key())) {
                     types.insert(it.key(), 0);
-                    contexts.insertMulti(item, it.key());
+                    contexts.insert(item, it.key());
                 }
             }
         }
diff --git a/src/widgets/kernel/qgridlayout.cpp b/src/widgets/kernel/qgridlayout.cpp
index f1c6c96a6d..4f2b505e32 100644
--- a/src/widgets/kernel/qgridlayout.cpp
+++ b/src/widgets/kernel/qgridlayout.cpp
@@ -1330,8 +1330,8 @@ QLayoutItem *QGridLayout::itemAt(int index) const
 /*!
     \since 4.4
 
-    Returns the layout item that occupies cell (\a row, \a column), or 0 if
-    the cell is empty.
+    Returns the layout item that occupies cell (\a row, \a column), or
+    \nullptr if the cell is empty.
 
     \sa getItemPosition(), indexOf()
 */
@@ -1346,7 +1346,7 @@ QLayoutItem *QGridLayout::itemAtPosition(int row, int column) const
             return box->item();
         }
     }
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/widgets/kernel/qlayout.cpp b/src/widgets/kernel/qlayout.cpp
index eac5674161..e3f6a56875 100644
--- a/src/widgets/kernel/qlayout.cpp
+++ b/src/widgets/kernel/qlayout.cpp
@@ -109,7 +109,7 @@ static int menuBarHeightForWidth(QWidget *menubar, int w)
 
 /*!
     Constructs a new top-level QLayout, with parent \a parent.
-    \a parent may not be a \c nullptr.
+    \a parent may not be a \nullptr.
 
     The layout is set directly as the top-level layout for
     \a parent. There can be only one top-level layout for a
@@ -282,6 +282,7 @@ bool QLayout::setAlignment(QLayout *l, Qt::Alignment alignment)
     return false;
 }
 
+#if QT_DEPRECATED_SINCE(5, 13)
 /*!
     \property QLayout::margin
     \brief the width of the outside border of the layout
@@ -307,6 +308,15 @@ int QLayout::margin() const
 }
 
 /*!
+    \obsolete
+*/
+void QLayout::setMargin(int margin)
+{
+    setContentsMargins(margin, margin, margin, margin);
+}
+
+#endif
+/*!
     \property QLayout::spacing
     \brief the spacing between widgets inside the layout
 
@@ -344,14 +354,6 @@ int QLayout::spacing() const
     }
 }
 
-/*!
-    \obsolete
-*/
-void QLayout::setMargin(int margin)
-{
-    setContentsMargins(margin, margin, margin, margin);
-}
-
 void QLayout::setSpacing(int spacing)
 {
     if (QBoxLayout* boxlayout = qobject_cast<QBoxLayout*>(this)) {
@@ -474,8 +476,8 @@ QRect QLayout::contentsRect() const
 
 
 /*!
-    Returns the parent widget of this layout, or 0 if this layout is
-    not installed on any widget.
+    Returns the parent widget of this layout, or \nullptr if this
+    layout is not installed on any widget.
 
     If the layout is a sub-layout, this function returns the parent
     widget of the parent layout.
@@ -490,11 +492,11 @@ QWidget *QLayout::parentWidget() const
             QLayout *parentLayout = qobject_cast<QLayout*>(parent());
             if (Q_UNLIKELY(!parentLayout)) {
                 qWarning("QLayout::parentWidget: A layout can only have another layout as a parent.");
-                return 0;
+                return nullptr;
             }
             return parentLayout->parentWidget();
         } else {
-            return 0;
+            return nullptr;
         }
     } else {
         Q_ASSERT(parent() && parent()->isWidgetType());
@@ -950,8 +952,8 @@ void QLayout::setMenuBar(QWidget *widget)
 }
 
 /*!
-    Returns the menu bar set for this layout, or 0 if no menu bar is
-    set.
+    Returns the menu bar set for this layout, or \nullptr if no
+    menu bar is set.
 */
 
 QWidget *QLayout::menuBar() const
@@ -1130,8 +1132,9 @@ bool QLayout::activate()
 
     Searches for widget \a from and replaces it with widget \a to if found.
     Returns the layout item that contains the widget \a from on success.
-    Otherwise \c 0 is returned. If \a options contains \c Qt::FindChildrenRecursively
-    (the default), sub-layouts are searched for doing the replacement.
+    Otherwise \nullptr is returned.
+    If \a options contains \c Qt::FindChildrenRecursively  (the default),
+    sub-layouts are searched for doing the replacement.
     Any other flag in \a options is ignored.
 
     Notice that the returned item therefore might not belong to this layout,
diff --git a/src/widgets/kernel/qlayout.h b/src/widgets/kernel/qlayout.h
index 616f4e7164..35a04a35b2 100644
--- a/src/widgets/kernel/qlayout.h
+++ b/src/widgets/kernel/qlayout.h
@@ -63,7 +63,9 @@ class Q_WIDGETS_EXPORT QLayout : public QObject, public QLayoutItem
     Q_OBJECT
     Q_DECLARE_PRIVATE(QLayout)
 
+#if QT_DEPRECATED_SINCE(5, 13)
     Q_PROPERTY(int margin READ margin WRITE setMargin)
+#endif
     Q_PROPERTY(int spacing READ spacing WRITE setSpacing)
     Q_PROPERTY(SizeConstraint sizeConstraint READ sizeConstraint WRITE setSizeConstraint)
 public:
@@ -81,10 +83,12 @@ public:
     QLayout();
     ~QLayout();
 
+#if QT_DEPRECATED_SINCE(5, 13)
     int margin() const;
-    int spacing() const;
-
     void setMargin(int);
+#endif
+
+    int spacing() const;
     void setSpacing(int);
 
     void setContentsMargins(int left, int top, int right, int bottom);
diff --git a/src/widgets/kernel/qlayoutitem.cpp b/src/widgets/kernel/qlayoutitem.cpp
index 25890e888b..9e6d1c5eac 100644
--- a/src/widgets/kernel/qlayoutitem.cpp
+++ b/src/widgets/kernel/qlayoutitem.cpp
@@ -309,24 +309,24 @@ void QLayoutItem::invalidate()
 
 /*!
     If this item is a QLayout, it is returned as a QLayout; otherwise
-    0 is returned. This function provides type-safe casting.
+    \nullptr is returned. This function provides type-safe casting.
 
     \sa spacerItem(), widget()
 */
-QLayout * QLayoutItem::layout()
+QLayout *QLayoutItem::layout()
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
     If this item is a QSpacerItem, it is returned as a QSpacerItem;
-    otherwise 0 is returned. This function provides type-safe casting.
+    otherwise \nullptr is returned. This function provides type-safe casting.
 
     \sa layout(), widget()
 */
-QSpacerItem * QLayoutItem::spacerItem()
+QSpacerItem *QLayoutItem::spacerItem()
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
@@ -354,7 +354,7 @@ QSpacerItem * QSpacerItem::spacerItem()
 
 /*!
     If this item manages a QWidget, returns that widget. Otherwise,
-    \c nullptr is returned.
+    \nullptr is returned.
 
     \note While the functions layout() and spacerItem() perform casts, this
     function returns another object: QLayout and QSpacerItem inherit QLayoutItem,
@@ -362,9 +362,9 @@ QSpacerItem * QSpacerItem::spacerItem()
 
     \sa layout(), spacerItem()
 */
-QWidget * QLayoutItem::widget()
+QWidget *QLayoutItem::widget()
 {
-    return 0;
+    return nullptr;
 }
 
 /*!
diff --git a/src/widgets/kernel/qopenglwidget.cpp b/src/widgets/kernel/qopenglwidget.cpp
index 89f860150f..cf15614680 100644
--- a/src/widgets/kernel/qopenglwidget.cpp
+++ b/src/widgets/kernel/qopenglwidget.cpp
@@ -1118,8 +1118,8 @@ void QOpenGLWidget::setTextureFormat(GLenum texFormat)
 /*!
     \return the active internal texture format if the widget has already
     initialized, the requested format if one was set but the widget has not yet
-    been made visible, or 0 if setTextureFormat() was not called and the widget
-    has not yet been made visible.
+    been made visible, or \nullptr if setTextureFormat() was not called and the
+    widget has not yet been made visible.
 
     \since 5.10
  */
diff --git a/src/widgets/kernel/qstackedlayout.cpp b/src/widgets/kernel/qstackedlayout.cpp
index 7430d833db..0412dc188d 100644
--- a/src/widgets/kernel/qstackedlayout.cpp
+++ b/src/widgets/kernel/qstackedlayout.cpp
@@ -378,20 +378,20 @@ void QStackedLayout::setCurrentWidget(QWidget *widget)
 
 
 /*!
-    Returns the current widget, or 0 if there are no widgets in this
-    layout.
+    Returns the current widget, or \nullptr if there are no widgets
+    in this layout.
 
     \sa currentIndex(), setCurrentWidget()
 */
 QWidget *QStackedLayout::currentWidget() const
 {
     Q_D(const QStackedLayout);
-    return d->index >= 0 ? d->list.at(d->index)->widget() : 0;
+    return d->index >= 0 ? d->list.at(d->index)->widget() : nullptr;
 }
 
 /*!
-    Returns the widget at the given \a index, or 0 if there is no
-    widget at the given position.
+    Returns the widget at the given \a index, or \nullptr if there is
+    no widget at the given position.
 
     \sa currentWidget(), indexOf()
 */
@@ -399,7 +399,7 @@ QWidget *QStackedLayout::widget(int index) const
 {
     Q_D(const QStackedLayout);
      if (index < 0 || index >= d->list.size())
-        return 0;
+        return nullptr;
     return d->list.at(index)->widget();
 }
 
diff --git a/src/widgets/kernel/qtooltip.cpp b/src/widgets/kernel/qtooltip.cpp
index cf0f3f153b..f81cb471fa 100644
--- a/src/widgets/kernel/qtooltip.cpp
+++ b/src/widgets/kernel/qtooltip.cpp
@@ -482,8 +482,8 @@ bool QTipLabel::tipChanged(const QPoint &pos, const QString &text, QObject *o)
 
     The \a rect is in the coordinates of the widget you specify with
     \a w. If the \a rect is not empty you must specify a widget.
-    Otherwise this argument can be 0 but it is used to determine the
-    appropriate screen on multi-head systems.
+    Otherwise this argument can be \nullptr but it is used to
+    determine the appropriate screen on multi-head systems.
 
     If \a text is empty the tool tip is hidden. If the text is the
     same as the currently shown tooltip, the tip will \e not move.
diff --git a/src/widgets/kernel/qwhatsthis.cpp b/src/widgets/kernel/qwhatsthis.cpp
index 1fa83d3238..4a798a7490 100644
--- a/src/widgets/kernel/qwhatsthis.cpp
+++ b/src/widgets/kernel/qwhatsthis.cpp
@@ -398,10 +398,10 @@ QWhatsThisPrivate::QWhatsThisPrivate()
 #ifdef QT_NO_CURSOR
         Q_UNUSED(sentEvent);
 #else
-        QApplication::setOverrideCursor((!sentEvent || !e.isAccepted())?
+        QGuiApplication::setOverrideCursor((!sentEvent || !e.isAccepted())?
                                         Qt::ForbiddenCursor:Qt::WhatsThisCursor);
     } else {
-        QApplication::setOverrideCursor(Qt::WhatsThisCursor);
+        QGuiApplication::setOverrideCursor(Qt::WhatsThisCursor);
 #endif
     }
 #ifndef QT_NO_ACCESSIBILITY
@@ -417,7 +417,7 @@ QWhatsThisPrivate::~QWhatsThisPrivate()
         action->setChecked(false);
 #endif // QT_CONFIG(action)
 #ifndef QT_NO_CURSOR
-    QApplication::restoreOverrideCursor();
+    QGuiApplication::restoreOverrideCursor();
 #endif
 #ifndef QT_NO_ACCESSIBILITY
     QAccessibleEvent event(this, QAccessible::ContextHelpEnd);
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 332eee9c03..b71a0ed052 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -511,10 +511,10 @@ void QWidget::setAutoFillBackground(bool enabled)
     Every widget's constructor accepts one or two standard arguments:
 
     \list 1
-        \li  \c{QWidget *parent = 0} is the parent of the new widget. If it is 0
-            (the default), the new widget will be a window. If not, it will be
-            a child of \e parent, and be constrained by \e parent's geometry
-            (unless you specify Qt::Window as window flag).
+        \li  \c{QWidget *parent = \nullptr} is the parent of the new widget.
+            If it is \nullptr (the default), the new widget will be a window.
+            If not, it will be a child of \e parent, and be constrained by
+            \e parent's geometry (unless you specify Qt::Window as window flag).
         \li  \c{Qt::WindowFlags f = 0} (where available) sets the window flags;
             the default is suitable for almost all widgets, but to get, for
             example, a window without a window system frame, you must use
@@ -1003,14 +1003,14 @@ struct QWidgetExceptionCleaner
     Constructs a widget which is a child of \a parent, with  widget
     flags set to \a f.
 
-    If \a parent is 0, the new widget becomes a window. If
+    If \a parent is \nullptr, the new widget becomes a window. If
     \a parent is another widget, this widget becomes a child window
     inside \a parent. The new widget is deleted when its \a parent is
     deleted.
 
     The widget flags argument, \a f, is normally 0, but it can be set
-    to customize the frame of a window (i.e. \a
-    parent must be 0). To customize the frame, use a value composed
+    to customize the frame of a window (i.e. \a parent must be
+    \nullptr). To customize the frame, use a value composed
     from the bitwise OR of any of the \l{Qt::WindowFlags}{window flags}.
 
     If you add a child widget to an already visible widget you must
@@ -2413,29 +2413,34 @@ static inline void fillRegion(QPainter *painter, const QRegion &rgn, const QBrus
     }
 }
 
-void QWidgetPrivate::paintBackground(QPainter *painter, const QRegion &rgn, int flags) const
+bool QWidgetPrivate::updateBrushOrigin(QPainter *painter, const QBrush &brush) const
 {
-    Q_Q(const QWidget);
-
 #if QT_CONFIG(scrollarea)
-    bool resetBrushOrigin = false;
-    QPointF oldBrushOrigin;
+    Q_Q(const QWidget);
     //If we are painting the viewport of a scrollarea, we must apply an offset to the brush in case we are drawing a texture
+    if (brush.style() == Qt::NoBrush || brush.style() == Qt::SolidPattern)
+        return false;
     QAbstractScrollArea *scrollArea = qobject_cast<QAbstractScrollArea *>(parent);
     if (scrollArea && scrollArea->viewport() == q) {
         QObjectData *scrollPrivate = static_cast<QWidget *>(scrollArea)->d_ptr.data();
         QAbstractScrollAreaPrivate *priv = static_cast<QAbstractScrollAreaPrivate *>(scrollPrivate);
-        oldBrushOrigin = painter->brushOrigin();
-        resetBrushOrigin = true;
         painter->setBrushOrigin(-priv->contentsOffset());
-
     }
 #endif // QT_CONFIG(scrollarea)
+    return true;
+}
+
+void QWidgetPrivate::paintBackground(QPainter *painter, const QRegion &rgn, int flags) const
+{
+    Q_Q(const QWidget);
 
+    bool brushOriginSet = false;
     const QBrush autoFillBrush = q->palette().brush(q->backgroundRole());
 
     if ((flags & DrawAsRoot) && !(q->autoFillBackground() && autoFillBrush.isOpaque())) {
         const QBrush bg = q->palette().brush(QPalette::Window);
+        if (!brushOriginSet)
+            brushOriginSet = updateBrushOrigin(painter, bg);
         if (!(flags & DontSetCompositionMode)) {
             //copy alpha straight in
             QPainter::CompositionMode oldMode = painter->compositionMode();
@@ -2447,8 +2452,11 @@ void QWidgetPrivate::paintBackground(QPainter *painter, const QRegion &rgn, int
         }
     }
 
-    if (q->autoFillBackground())
+    if (q->autoFillBackground()) {
+        if (!brushOriginSet)
+            brushOriginSet = updateBrushOrigin(painter, autoFillBrush);
         fillRegion(painter, rgn, autoFillBrush);
+    }
 
     if (q->testAttribute(Qt::WA_StyledBackground)) {
         painter->setClipRegion(rgn);
@@ -2456,11 +2464,6 @@ void QWidgetPrivate::paintBackground(QPainter *painter, const QRegion &rgn, int
         opt.initFrom(q);
         q->style()->drawPrimitive(QStyle::PE_Widget, &opt, painter, q);
     }
-
-#if QT_CONFIG(scrollarea)
-    if (resetBrushOrigin)
-        painter->setBrushOrigin(oldBrushOrigin);
-#endif // QT_CONFIG(scrollarea)
 }
 
 /*
@@ -2494,12 +2497,12 @@ void QWidgetPrivate::deactivateWidgetCleanup()
 
     The window identifier type depends on the underlying window
     system, see \c qwindowdefs.h for the actual definition. If there
-    is no widget with this identifier, 0 is returned.
+    is no widget with this identifier, \nullptr is returned.
 */
 
 QWidget *QWidget::find(WId id)
 {
-    return QWidgetPrivate::mapper ? QWidgetPrivate::mapper->value(id, 0) : 0;
+    return QWidgetPrivate::mapper ? QWidgetPrivate::mapper->value(id, 0) : nullptr;
 }
 
 
@@ -3276,7 +3279,7 @@ void QWidget::addActions(QList<QAction*> actions)
 
 /*!
     Inserts the action \a action to this widget's list of actions,
-    before the action \a before. It appends the action if \a before is 0 or
+    before the action \a before. It appends the action if \a before is \nullptr or
     \a before is not a valid action for this widget.
 
     A QWidget should only have one of each action.
@@ -3310,7 +3313,7 @@ void QWidget::insertAction(QAction *before, QAction *action)
 
 /*!
     Inserts the actions \a actions to this widget's list of actions,
-    before the action \a before. It appends the action if \a before is 0 or
+    before the action \a before. It appends the action if \a before is \nullptr or
     \a before is not a valid action for this widget.
 
     A QWidget can have at most one of each action.
@@ -4229,7 +4232,7 @@ void QWidget::setFixedHeight(int h)
 
 /*!
     Translates the widget coordinate \a pos to the coordinate system
-    of \a parent. The \a parent must not be 0 and must be a parent
+    of \a parent. The \a parent must not be \nullptr and must be a parent
     of the calling widget.
 
     \sa mapFrom(), mapToParent(), mapToGlobal(), underMouse()
@@ -4254,7 +4257,7 @@ QPoint QWidget::mapTo(const QWidget * parent, const QPoint & pos) const
 /*!
     Translates the widget coordinate \a pos from the coordinate system
     of \a parent to this widget's coordinate system. The \a parent
-    must not be 0 and must be a parent of the calling widget.
+    must not be \nullptr and must be a parent of the calling widget.
 
     \sa mapTo(), mapFromParent(), mapFromGlobal(), underMouse()
 */
@@ -4333,7 +4336,8 @@ QWidget *QWidget::window() const
     \since 4.4
 
     Returns the native parent for this widget, i.e. the next ancestor widget
-    that has a system identifier, or 0 if it does not have any native parent.
+    that has a system identifier, or \nullptr if it does not have any native
+    parent.
 
     \sa effectiveWinId()
 */
@@ -4954,9 +4958,9 @@ void QWidget::unsetLayoutDirection()
     Some underlying window implementations will reset the cursor if it
     leaves a widget even if the mouse is grabbed. If you want to have
     a cursor set for all widgets, even when outside the window, consider
-    QApplication::setOverrideCursor().
+    QGuiApplication::setOverrideCursor().
 
-    \sa QApplication::setOverrideCursor()
+    \sa QGuiApplication::setOverrideCursor()
 */
 
 #ifndef QT_NO_CURSOR
@@ -5269,7 +5273,7 @@ QPixmap QWidget::grab(const QRect &rectangle)
     \brief The graphicsEffect function returns a pointer to the
     widget's graphics effect.
 
-    If the widget has no graphics effect, 0 is returned.
+    If the widget has no graphics effect, \nullptr is returned.
 
     \since 4.6
 
@@ -5313,7 +5317,7 @@ void QWidget::setGraphicsEffect(QGraphicsEffect *effect)
         return;
 
     if (d->graphicsEffect) {
-        d->invalidateBuffer(rect());
+        d->invalidateBackingStore(rect());
         delete d->graphicsEffect;
         d->graphicsEffect = 0;
     }
@@ -5733,12 +5737,10 @@ void QWidgetPrivate::render(QPaintDevice *target, const QPoint &targetOffset,
     QPoint offset = targetOffset;
     offset -= paintRegion.boundingRect().topLeft();
     QPoint redirectionOffset;
-    QPaintDevice *redirected = 0;
+    QPaintDevice *redirected = nullptr;
 
     if (target->devType() == QInternal::Widget)
         redirected = static_cast<QWidget *>(target)->d_func()->redirected(&redirectionOffset);
-    if (!redirected)
-        redirected = QPainter::redirected(target, &redirectionOffset);
 
     if (redirected) {
         target = redirected;
@@ -5915,10 +5917,10 @@ QPixmap QWidgetEffectSourcePrivate::pixmap(Qt::CoordinateSystem system, QPoint *
 
     Finds the nearest widget embedded in a graphics proxy widget along the chain formed by this
     widget and its ancestors. The search starts at \a origin (inclusive).
-    If successful, the function returns the proxy that embeds the widget, or 0 if no embedded
-    widget was found.
+    If successful, the function returns the proxy that embeds the widget, or \nullptr if no
+    embedded widget was found.
 */
-QGraphicsProxyWidget * QWidgetPrivate::nearestGraphicsProxyWidget(const QWidget *origin)
+QGraphicsProxyWidget *QWidgetPrivate::nearestGraphicsProxyWidget(const QWidget *origin)
 {
     if (origin) {
         QWExtra *extra = origin->d_func()->extra;
@@ -5926,7 +5928,7 @@ QGraphicsProxyWidget * QWidgetPrivate::nearestGraphicsProxyWidget(const QWidget
             return extra->proxyWidget;
         return nearestGraphicsProxyWidget(origin->parentWidget());
     }
-    return 0;
+    return nullptr;
 }
 #endif
 
@@ -6398,7 +6400,7 @@ void QWidget::setWindowRole(const QString &role)
 
 
 /*!
-    Sets the widget's focus proxy to widget \a w. If \a w is 0, the
+    Sets the widget's focus proxy to widget \a w. If \a w is \nullptr, the
     function resets this widget to have no focus proxy.
 
     Some widgets can "have focus", but create a child widget, such as
@@ -6431,15 +6433,15 @@ void QWidget::setFocusProxy(QWidget * w)
 
 
 /*!
-    Returns the focus proxy, or 0 if there is no focus proxy.
+    Returns the focus proxy, or \nullptr if there is no focus proxy.
 
     \sa setFocusProxy()
 */
 
-QWidget * QWidget::focusProxy() const
+QWidget *QWidget::focusProxy() const
 {
     Q_D(const QWidget);
-    return d->extra ? (QWidget *)d->extra->focus_proxy : 0;
+    return d->extra ? (QWidget *)d->extra->focus_proxy : nullptr;
 }
 
 
@@ -7338,11 +7340,11 @@ void QWidgetPrivate::setGeometry_sys(int x, int y, int w, int h, bool isMove)
                 if (renderToTexture) {
                     QRegion updateRegion(q->geometry());
                     updateRegion += QRect(oldPos, olds);
-                    q->parentWidget()->d_func()->invalidateBuffer(updateRegion);
+                    q->parentWidget()->d_func()->invalidateBackingStore(updateRegion);
                 } else if (isMove && !isResize) {
                     moveRect(QRect(oldPos, olds), x - oldPos.x(), y - oldPos.y());
                 } else {
-                    invalidateBuffer_resizeHelper(oldPos, olds);
+                    invalidateBackingStore_resizeHelper(oldPos, olds);
                 }
             }
         }
@@ -8104,7 +8106,7 @@ void QWidgetPrivate::show_sys()
     QWidgetWindow *window = windowHandle();
 
     if (q->testAttribute(Qt::WA_DontShowOnScreen)) {
-        invalidateBuffer(q->rect());
+        invalidateBackingStore(q->rect());
         q->setAttribute(Qt::WA_Mapped);
         // add our window the modal window list (native dialogs)
         if (window && q->isWindow()
@@ -8147,7 +8149,7 @@ void QWidgetPrivate::show_sys()
 #ifndef QT_NO_CURSOR
         qt_qpa_set_cursor(q, false); // Needed in case cursor was set before show
 #endif
-        invalidateBuffer(q->rect());
+        invalidateBackingStore(q->rect());
         window->setNativeWindowVisibility(true);
         // Was the window moved by the Window system or QPlatformWindow::initialGeometry() ?
         if (window->isTopLevel()) {
@@ -8261,12 +8263,12 @@ void QWidgetPrivate::hide_sys()
         QWidget *p = q->parentWidget();
         if (p &&p->isVisible()) {
             if (renderToTexture)
-                p->d_func()->invalidateBuffer(q->geometry());
+                p->d_func()->invalidateBackingStore(q->geometry());
             else
-                invalidateBuffer(q->rect());
+                invalidateBackingStore(q->rect());
         }
     } else {
-        invalidateBuffer(q->rect());
+        invalidateBackingStore(q->rect());
     }
 
     if (window)
@@ -8820,7 +8822,7 @@ QSize QWidget::minimumSizeHint() const
 /*!
     \fn QWidget *QWidget::parentWidget() const
 
-    Returns the parent of this widget, or 0 if it does not have any
+    Returns the parent of this widget, or \nullptr if it does not have any
     parent widget.
 */
 
@@ -10230,7 +10232,7 @@ QRegion QWidget::mask() const
 }
 
 /*!
-    Returns the layout manager that is installed on this widget, or 0
+    Returns the layout manager that is installed on this widget, or \nullptr
     if no layout manager is installed.
 
     The layout manager sets the geometry of the widget's children
@@ -11902,7 +11904,7 @@ void QWidget::raise()
 
         QRegion region(rect());
         d->subtractOpaqueSiblings(region);
-        d->invalidateBuffer(region);
+        d->invalidateBackingStore(region);
     }
     if (testAttribute(Qt::WA_WState_Created))
         d->raise_sys();
@@ -11922,7 +11924,7 @@ void QWidgetPrivate::raise_sys()
     } else if (renderToTexture) {
         if (QWidget *p = q->parentWidget()) {
             setDirtyOpaqueRegion();
-            p->d_func()->invalidateBuffer(effectiveRectFor(q->geometry()));
+            p->d_func()->invalidateBackingStore(effectiveRectFor(q->geometry()));
         }
     }
 }
@@ -11972,7 +11974,7 @@ void QWidgetPrivate::lower_sys()
         q->windowHandle()->lower();
     } else if (QWidget *p = q->parentWidget()) {
         setDirtyOpaqueRegion();
-        p->d_func()->invalidateBuffer(effectiveRectFor(q->geometry()));
+        p->d_func()->invalidateBackingStore(effectiveRectFor(q->geometry()));
     }
 }
 
@@ -12016,7 +12018,7 @@ void QWidgetPrivate::stackUnder_sys(QWidget*)
     Q_Q(QWidget);
     if (QWidget *p = q->parentWidget()) {
         setDirtyOpaqueRegion();
-        p->d_func()->invalidateBuffer(effectiveRectFor(q->geometry()));
+        p->d_func()->invalidateBackingStore(effectiveRectFor(q->geometry()));
     }
 }
 
@@ -12118,14 +12120,14 @@ bool QWidgetPrivate::navigateToDirection(Direction direction)
     Searches for a widget that is positioned in the \a direction, starting
     from the current focusWidget.
 
-    Returns the pointer to a found widget or 0, if there was no widget in
-    that direction.
+    Returns the pointer to a found widget or \nullptr, if there was no widget
+    in that direction.
 */
 QWidget *QWidgetPrivate::widgetInNavigationDirection(Direction direction)
 {
     const QWidget *sourceWidget = QApplication::focusWidget();
     if (!sourceWidget)
-        return 0;
+        return nullptr;
     const QRect sourceRect = sourceWidget->rect().translated(sourceWidget->mapToGlobal(QPoint()));
     const int sourceX =
             (direction == DirectionNorth || direction == DirectionSouth) ?
@@ -12139,7 +12141,7 @@ QWidget *QWidgetPrivate::widgetInNavigationDirection(Direction direction)
     const QPoint sourceCenter = sourceRect.center();
     const QWidget *sourceWindow = sourceWidget->window();
 
-    QWidget *targetWidget = 0;
+    QWidget *targetWidget = nullptr;
     int shortestDistance = INT_MAX;
 
     const auto targetCandidates = QApplication::allWidgets();
@@ -12458,7 +12460,7 @@ void QWidget::destroy(bool destroyWindow, bool destroySubWindows)
 
     d->aboutToDestroy();
     if (!isWindow() && parentWidget())
-        parentWidget()->d_func()->invalidateBuffer(d->effectiveRectFor(geometry()));
+        parentWidget()->d_func()->invalidateBackingStore(d->effectiveRectFor(geometry()));
     d->deactivateWidgetCleanup();
 
     if ((windowType() == Qt::Popup) && qApp)
@@ -12806,7 +12808,7 @@ void QWidget::releaseKeyboard()
     Returns the widget that is currently grabbing the mouse input.
 
     If no widget in this application is currently grabbing the mouse,
-    0 is returned.
+    \nullptr is returned.
 
     \sa grabMouse(), keyboardGrabber()
 */
@@ -12823,7 +12825,7 @@ QWidget *QWidget::mouseGrabber()
     Returns the widget that is currently grabbing the keyboard input.
 
     If no widget in this application is currently grabbing the
-    keyboard, 0 is returned.
+    keyboard, \nullptr is returned.
 
     \sa grabMouse(), mouseGrabber()
 */
diff --git a/src/widgets/kernel/qwidget.h b/src/widgets/kernel/qwidget.h
index 9d5fe89c70..4e5ef5a111 100644
--- a/src/widgets/kernel/qwidget.h
+++ b/src/widgets/kernel/qwidget.h
@@ -235,7 +235,10 @@ public:
 
     bool isEnabled() const;
     bool isEnabledTo(const QWidget *) const;
+#if QT_DEPRECATED_SINCE(5, 13)
+    QT_DEPRECATED_X ("Use isEnabled() instead")
     bool isEnabledToTLW() const;
+#endif
 
 public Q_SLOTS:
     void setEnabled(bool);
@@ -769,8 +772,10 @@ inline bool QWidget::isEnabled() const
 inline bool QWidget::isModal() const
 { return data->window_modality != Qt::NonModal; }
 
+#if QT_DEPRECATED_SINCE(5, 13)
 inline bool QWidget::isEnabledToTLW() const
 { return isEnabled(); }
+#endif
 
 inline int QWidget::minimumWidth() const
 { return minimumSize().width(); }
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index 7e4ea2cc0c..797963b931 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -150,7 +150,7 @@ public:
     }
 
 private:
-    Q_DISABLE_COPY(QWidgetBackingStoreTracker)
+    Q_DISABLE_COPY_MOVE(QWidgetBackingStoreTracker)
 
 private:
     QWidgetBackingStore* m_ptr;
@@ -402,6 +402,7 @@ public:
 
     void setUpdatesEnabled_helper(bool );
 
+    bool updateBrushOrigin(QPainter *, const QBrush &brush) const;
     void paintBackground(QPainter *, const QRegion &, int flags = DrawAsRoot) const;
     bool isAboutToShow() const;
     QRegion prepareToRender(const QRegion &region, QWidget::RenderFlags renderFlags);
@@ -451,10 +452,11 @@ public:
     void scrollChildren(int dx, int dy);
     void moveRect(const QRect &, int dx, int dy);
     void scrollRect(const QRect &, int dx, int dy);
-    void invalidateBuffer_resizeHelper(const QPoint &oldPos, const QSize &oldSize);
-    // ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
-    void invalidateBuffer(const QRegion &);
-    void invalidateBuffer(const QRect &);
+    void invalidateBackingStore_resizeHelper(const QPoint &oldPos, const QSize &oldSize);
+
+    template <class T>
+    void invalidateBackingStore(const T &);
+
     QRegion overlappedRegion(const QRect &rect, bool breakAfterFirst = false) const;
     void syncBackingStore();
     void syncBackingStore(const QRegion &region);
@@ -606,6 +608,11 @@ public:
         return extra ? extra->nativeChildrenForced : false;
     }
 
+    inline QRect effectiveRectFor(const QRegion &region) const
+    {
+        return effectiveRectFor(region.boundingRect());
+    }
+
     inline QRect effectiveRectFor(const QRect &rect) const
     {
 #if QT_CONFIG(graphicseffect)
diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index a32eb2a03b..0481dffda8 100644
--- a/src/widgets/kernel/qwidgetbackingstore.cpp
+++ b/src/widgets/kernel/qwidgetbackingstore.cpp
@@ -507,6 +507,9 @@ void QWidgetBackingStore::sendUpdateRequest(QWidget *widget, UpdateTime updateTi
     }
 }
 
+static inline QRect widgetRectFor(QWidget *, const QRect &r) { return r; }
+static inline QRect widgetRectFor(QWidget *widget, const QRegion &) { return widget->rect(); }
+
 /*!
     Marks the region of the widget as dirty (if not already marked as dirty) and
     posts an UpdateRequest event to the top-level widget (if not already posted).
@@ -517,42 +520,44 @@ void QWidgetBackingStore::sendUpdateRequest(QWidget *widget, UpdateTime updateTi
 
     If the widget paints directly on screen, the event is sent to the widget
     instead of the top-level widget, and bufferState is completely ignored.
-
-    ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
 */
-void QWidgetBackingStore::markDirty(const QRegion &rgn, QWidget *widget,
-                                    UpdateTime updateTime, BufferState bufferState)
+template <class T>
+void QWidgetBackingStore::markDirty(const T &r, QWidget *widget, UpdateTime updateTime, BufferState bufferState)
 {
     Q_ASSERT(tlw->d_func()->extra);
     Q_ASSERT(tlw->d_func()->extra->topextra);
     Q_ASSERT(!tlw->d_func()->extra->topextra->inTopLevelResize);
     Q_ASSERT(widget->isVisible() && widget->updatesEnabled());
     Q_ASSERT(widget->window() == tlw);
-    Q_ASSERT(!rgn.isEmpty());
+    Q_ASSERT(!r.isEmpty());
 
 #if QT_CONFIG(graphicseffect)
     widget->d_func()->invalidateGraphicsEffectsRecursively();
-#endif // QT_CONFIG(graphicseffect)
+#endif
+
+    QRect widgetRect = widgetRectFor(widget, r);
+
+    // ---------------------------------------------------------------------------
 
     if (widget->d_func()->paintOnScreen()) {
         if (widget->d_func()->dirty.isEmpty()) {
-            widget->d_func()->dirty = rgn;
+            widget->d_func()->dirty = r;
             sendUpdateRequest(widget, updateTime);
             return;
-        } else if (qt_region_strictContains(widget->d_func()->dirty, widget->rect())) {
+        } else if (qt_region_strictContains(widget->d_func()->dirty, widgetRect)) {
             if (updateTime == UpdateNow)
                 sendUpdateRequest(widget, updateTime);
-            return; // Already dirty.
+            return; // Already dirty
         }
 
         const bool eventAlreadyPosted = !widget->d_func()->dirty.isEmpty();
-        widget->d_func()->dirty += rgn;
+        widget->d_func()->dirty += r;
         if (!eventAlreadyPosted || updateTime == UpdateNow)
             sendUpdateRequest(widget, updateTime);
         return;
     }
 
-    const QPoint offset = widget->mapTo(tlw, QPoint());
+    // ---------------------------------------------------------------------------
 
     if (QWidgetPrivate::get(widget)->renderToTexture) {
         if (!widget->d_func()->inDirtyList)
@@ -562,133 +567,67 @@ void QWidgetBackingStore::markDirty(const QRegion &rgn, QWidget *widget,
         return;
     }
 
-    const QRect widgetRect = widget->d_func()->effectiveRectFor(widget->rect());
-    if (qt_region_strictContains(dirty, widgetRect.translated(offset))) {
+    // ---------------------------------------------------------------------------
+
+    QRect effectiveWidgetRect = widget->d_func()->effectiveRectFor(widgetRect);
+    const QPoint offset = widget->mapTo(tlw, QPoint());
+    QRect translatedRect = effectiveWidgetRect.translated(offset);
+#if QT_CONFIG(graphicseffect)
+    // Graphics effects may exceed window size, clamp
+    translatedRect = translatedRect.intersected(QRect(QPoint(), tlw->size()));
+#endif
+    if (qt_region_strictContains(dirty, translatedRect)) {
         if (updateTime == UpdateNow)
             sendUpdateRequest(tlw, updateTime);
-        return; // Already dirty.
+        return; // Already dirty
     }
 
+    // ---------------------------------------------------------------------------
+
     if (bufferState == BufferInvalid) {
         const bool eventAlreadyPosted = !dirty.isEmpty() || updateRequestSent;
 #if QT_CONFIG(graphicseffect)
         if (widget->d_func()->graphicsEffect)
-            dirty += widget->d_func()->effectiveRectFor(rgn.boundingRect()).translated(offset);
+            dirty += widget->d_func()->effectiveRectFor(r).translated(offset);
         else
-#endif // QT_CONFIG(graphicseffect)
-            dirty += rgn.translated(offset);
+#endif
+            dirty += r.translated(offset);
+
         if (!eventAlreadyPosted || updateTime == UpdateNow)
             sendUpdateRequest(tlw, updateTime);
         return;
     }
 
+    // ---------------------------------------------------------------------------
+
     if (dirtyWidgets.isEmpty()) {
-        addDirtyWidget(widget, rgn);
+        addDirtyWidget(widget, r);
         sendUpdateRequest(tlw, updateTime);
         return;
     }
 
+    // ---------------------------------------------------------------------------
+
     if (widget->d_func()->inDirtyList) {
-        if (!qt_region_strictContains(widget->d_func()->dirty, widgetRect)) {
+        if (!qt_region_strictContains(widget->d_func()->dirty, effectiveWidgetRect)) {
 #if QT_CONFIG(graphicseffect)
             if (widget->d_func()->graphicsEffect)
-                widget->d_func()->dirty += widget->d_func()->effectiveRectFor(rgn.boundingRect());
+                widget->d_func()->dirty += widget->d_func()->effectiveRectFor(r);
             else
-#endif // QT_CONFIG(graphicseffect)
-                widget->d_func()->dirty += rgn;
+#endif
+                widget->d_func()->dirty += r;
         }
     } else {
-        addDirtyWidget(widget, rgn);
-    }
-
-    if (updateTime == UpdateNow)
-        sendUpdateRequest(tlw, updateTime);
-}
-
-/*!
-    This function is equivalent to calling markDirty(QRegion(rect), ...), but
-    is more efficient as it eliminates QRegion operations/allocations and can
-    use the rect more precisely for additional cut-offs.
-
-    ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
-*/
-void QWidgetBackingStore::markDirty(const QRect &rect, QWidget *widget,
-                                    UpdateTime updateTime, BufferState bufferState)
-{
-    Q_ASSERT(tlw->d_func()->extra);
-    Q_ASSERT(tlw->d_func()->extra->topextra);
-    Q_ASSERT(!tlw->d_func()->extra->topextra->inTopLevelResize);
-    Q_ASSERT(widget->isVisible() && widget->updatesEnabled());
-    Q_ASSERT(widget->window() == tlw);
-    Q_ASSERT(!rect.isEmpty());
-
-#if QT_CONFIG(graphicseffect)
-    widget->d_func()->invalidateGraphicsEffectsRecursively();
-#endif // QT_CONFIG(graphicseffect)
-
-    if (widget->d_func()->paintOnScreen()) {
-        if (widget->d_func()->dirty.isEmpty()) {
-            widget->d_func()->dirty = QRegion(rect);
-            sendUpdateRequest(widget, updateTime);
-            return;
-        } else if (qt_region_strictContains(widget->d_func()->dirty, rect)) {
-            if (updateTime == UpdateNow)
-                sendUpdateRequest(widget, updateTime);
-            return; // Already dirty.
-        }
-
-        const bool eventAlreadyPosted = !widget->d_func()->dirty.isEmpty();
-        widget->d_func()->dirty += rect;
-        if (!eventAlreadyPosted || updateTime == UpdateNow)
-            sendUpdateRequest(widget, updateTime);
-        return;
-    }
-
-    if (QWidgetPrivate::get(widget)->renderToTexture) {
-        if (!widget->d_func()->inDirtyList)
-            addDirtyRenderToTextureWidget(widget);
-        if (!updateRequestSent || updateTime == UpdateNow)
-            sendUpdateRequest(tlw, updateTime);
-        return;
+        addDirtyWidget(widget, r);
     }
 
-
-    const QRect widgetRect = widget->d_func()->effectiveRectFor(rect);
-    QRect translatedRect = widgetRect;
-    if (widget != tlw)
-        translatedRect.translate(widget->mapTo(tlw, QPoint()));
-    // Graphics effects may exceed window size, clamp.
-    translatedRect = translatedRect.intersected(QRect(QPoint(), tlw->size()));
-    if (qt_region_strictContains(dirty, translatedRect)) {
-        if (updateTime == UpdateNow)
-            sendUpdateRequest(tlw, updateTime);
-        return; // Already dirty
-    }
-
-    if (bufferState == BufferInvalid) {
-        const bool eventAlreadyPosted = !dirty.isEmpty();
-        dirty += translatedRect;
-        if (!eventAlreadyPosted || updateTime == UpdateNow)
-            sendUpdateRequest(tlw, updateTime);
-        return;
-    }
-
-    if (dirtyWidgets.isEmpty()) {
-        addDirtyWidget(widget, rect);
-        sendUpdateRequest(tlw, updateTime);
-        return;
-    }
-
-    if (widget->d_func()->inDirtyList) {
-        if (!qt_region_strictContains(widget->d_func()->dirty, widgetRect))
-            widget->d_func()->dirty += widgetRect;
-    } else {
-        addDirtyWidget(widget, rect);
-    }
+    // ---------------------------------------------------------------------------
 
     if (updateTime == UpdateNow)
         sendUpdateRequest(tlw, updateTime);
 }
+template void QWidgetBackingStore::markDirty<QRect>(const QRect &, QWidget *, UpdateTime, BufferState);
+template void QWidgetBackingStore::markDirty<QRegion>(const QRegion &, QWidget *, UpdateTime, BufferState);
 
 /*!
     Marks the \a region of the \a widget as dirty on screen. The \a region will be copied from
@@ -859,11 +798,11 @@ void QWidgetPrivate::moveRect(const QRect &rect, int dx, int dy)
         if (!extra || !extra->hasMask) {
             parentR -= newRect;
         } else {
-            // invalidateBuffer() excludes anything outside the mask
+            // invalidateBackingStore() excludes anything outside the mask
             parentR += newRect & clipR;
         }
-        pd->invalidateBuffer(parentR);
-        invalidateBuffer((newRect & clipR).translated(-data.crect.topLeft()));
+        pd->invalidateBackingStore(parentR);
+        invalidateBackingStore((newRect & clipR).translated(-data.crect.topLeft()));
     } else {
 
         QWidgetBackingStore *wbs = x->backingStoreTracker.data();
@@ -894,7 +833,7 @@ void QWidgetPrivate::moveRect(const QRect &rect, int dx, int dy)
         if (childUpdatesEnabled) {
             if (!overlappedExpose.isEmpty()) {
                 overlappedExpose.translate(-data.crect.topLeft());
-                invalidateBuffer(overlappedExpose);
+                invalidateBackingStore(overlappedExpose);
             }
             if (!childExpose.isEmpty()) {
                 childExpose.translate(-data.crect.topLeft());
@@ -944,9 +883,9 @@ void QWidgetPrivate::scrollRect(const QRect &rect, int dx, int dy)
         if (!overlappedRegion(scrollRect.translated(data.crect.topLeft()), true).isEmpty()) {
             QRegion region(scrollRect);
             subtractOpaqueSiblings(region);
-            invalidateBuffer(region);
+            invalidateBackingStore(region);
         }else {
-            invalidateBuffer(scrollRect);
+            invalidateBackingStore(scrollRect);
         }
     } else {
         const QPoint toplevelOffset = q->mapTo(tlw, QPoint());
@@ -987,7 +926,7 @@ void QWidgetPrivate::scrollRect(const QRect &rect, int dx, int dy)
             return;
 
         if (!overlappedExpose.isEmpty())
-            invalidateBuffer(overlappedExpose);
+            invalidateBackingStore(overlappedExpose);
         if (!childExpose.isEmpty()) {
             wbs->markDirty(childExpose, q);
             isScrolled = true;
@@ -1471,26 +1410,11 @@ void QWidgetBackingStore::flush(QWidget *widget)
     dirtyOnScreenWidgets->clear();
 }
 
-static inline bool discardInvalidateBufferRequest(QWidget *widget, QTLWExtra *tlwExtra)
-{
-    Q_ASSERT(widget);
-    if (QApplication::closingDown())
-        return true;
-
-    if (!tlwExtra || tlwExtra->inTopLevelResize || !tlwExtra->backingStore)
-        return true;
-
-    if (!widget->isVisible() || !widget->updatesEnabled())
-        return true;
-
-    return false;
-}
-
 /*!
-    Invalidates the buffer when the widget is resized.
+    Invalidates the backing store when the widget is resized.
     Static areas are never invalidated unless absolutely needed.
 */
-void QWidgetPrivate::invalidateBuffer_resizeHelper(const QPoint &oldPos, const QSize &oldSize)
+void QWidgetPrivate::invalidateBackingStore_resizeHelper(const QPoint &oldPos, const QSize &oldSize)
 {
     Q_Q(QWidget);
     Q_ASSERT(!q->isWindow());
@@ -1515,10 +1439,10 @@ void QWidgetPrivate::invalidateBuffer_resizeHelper(const QPoint &oldPos, const Q
         if (hasStaticChildren) {
             QRegion dirty(newWidgetRect);
             dirty -= staticChildren;
-            invalidateBuffer(dirty);
+            invalidateBackingStore(dirty);
         } else {
             // Entire widget needs repaint.
-            invalidateBuffer(newWidgetRect);
+            invalidateBackingStore(newWidgetRect);
         }
 
         if (!parentAreaExposed)
@@ -1530,14 +1454,14 @@ void QWidgetPrivate::invalidateBuffer_resizeHelper(const QPoint &oldPos, const Q
             parentExpose &= QRect(oldPos, oldSize);
             if (hasStaticChildren)
                 parentExpose -= data.crect; // Offset is unchanged, safe to do this.
-            q->parentWidget()->d_func()->invalidateBuffer(parentExpose);
+            q->parentWidget()->d_func()->invalidateBackingStore(parentExpose);
         } else {
             if (hasStaticChildren && !graphicsEffect) {
                 QRegion parentExpose(QRect(oldPos, oldSize));
                 parentExpose -= data.crect; // Offset is unchanged, safe to do this.
-                q->parentWidget()->d_func()->invalidateBuffer(parentExpose);
+                q->parentWidget()->d_func()->invalidateBackingStore(parentExpose);
             } else {
-                q->parentWidget()->d_func()->invalidateBuffer(effectiveRectFor(QRect(oldPos, oldSize)));
+                q->parentWidget()->d_func()->invalidateBackingStore(effectiveRectFor(QRect(oldPos, oldSize)));
             }
         }
         return;
@@ -1558,7 +1482,7 @@ void QWidgetPrivate::invalidateBuffer_resizeHelper(const QPoint &oldPos, const Q
     if (!sizeDecreased || !oldWidgetRect.contains(newWidgetRect)) {
         QRegion newVisible(newWidgetRect);
         newVisible -= oldWidgetRect;
-        invalidateBuffer(newVisible);
+        invalidateBackingStore(newVisible);
     }
 
     if (!parentAreaExposed)
@@ -1570,74 +1494,56 @@ void QWidgetPrivate::invalidateBuffer_resizeHelper(const QPoint &oldPos, const Q
         QRegion parentExpose(oldRect);
         parentExpose &= extra->mask.translated(oldPos);
         parentExpose -= (extra->mask.translated(data.crect.topLeft()) & data.crect);
-        q->parentWidget()->d_func()->invalidateBuffer(parentExpose);
+        q->parentWidget()->d_func()->invalidateBackingStore(parentExpose);
     } else {
         QRegion parentExpose(oldRect);
         parentExpose -= data.crect;
-        q->parentWidget()->d_func()->invalidateBuffer(parentExpose);
+        q->parentWidget()->d_func()->invalidateBackingStore(parentExpose);
     }
 }
 
 /*!
-    Invalidates the \a rgn (in widget's coordinates) of the backing store, i.e.
-    all widgets intersecting with the region will be repainted when the backing store
-    is synced.
-
-    ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
+    Invalidates the \a r (in widget's coordinates) of the backing store, i.e.
+    all widgets intersecting with the region will be repainted when the backing
+    store is synced.
 */
-void QWidgetPrivate::invalidateBuffer(const QRegion &rgn)
+template <class T>
+void QWidgetPrivate::invalidateBackingStore(const T &r)
 {
-    Q_Q(QWidget);
-
-    QTLWExtra *tlwExtra = q->window()->d_func()->maybeTopData();
-    if (discardInvalidateBufferRequest(q, tlwExtra) || rgn.isEmpty())
+    if (r.isEmpty())
         return;
 
-    QRegion wrgn(rgn);
-    wrgn &= clipRect();
-    if (!graphicsEffect && extra && extra->hasMask)
-        wrgn &= extra->mask;
-    if (wrgn.isEmpty())
+    if (QApplication::closingDown())
         return;
 
-    tlwExtra->backingStoreTracker->markDirty(wrgn, q,
-            QWidgetBackingStore::UpdateLater, QWidgetBackingStore::BufferInvalid);
-}
-
-/*!
-    This function is equivalent to calling invalidateBuffer(QRegion(rect), ...), but
-    is more efficient as it eliminates QRegion operations/allocations and can
-    use the rect more precisely for additional cut-offs.
-
-    ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
-*/
-void QWidgetPrivate::invalidateBuffer(const QRect &rect)
-{
     Q_Q(QWidget);
-
-    QTLWExtra *tlwExtra = q->window()->d_func()->maybeTopData();
-    if (discardInvalidateBufferRequest(q, tlwExtra) || rect.isEmpty())
+    if (!q->isVisible() || !q->updatesEnabled())
         return;
 
-    QRect wRect(rect);
-    wRect &= clipRect();
-    if (wRect.isEmpty())
+    QTLWExtra *tlwExtra = q->window()->d_func()->maybeTopData();
+    if (!tlwExtra || tlwExtra->inTopLevelResize || !tlwExtra->backingStore)
         return;
 
-    if (graphicsEffect || !extra || !extra->hasMask) {
-        tlwExtra->backingStoreTracker->markDirty(wRect, q,
-                QWidgetBackingStore::UpdateLater, QWidgetBackingStore::BufferInvalid);
+    T clipped(r);
+    clipped &= clipRect();
+    if (clipped.isEmpty())
         return;
-    }
 
-    QRegion wRgn(extra->mask);
-    wRgn &= wRect;
-    if (wRgn.isEmpty())
-        return;
+    if (!graphicsEffect && extra && extra->hasMask) {
+        QRegion masked(extra->mask);
+        masked &= clipped;
+        if (masked.isEmpty())
+            return;
 
-    tlwExtra->backingStoreTracker->markDirty(wRgn, q,
+        tlwExtra->backingStoreTracker->markDirty(masked, q,
             QWidgetBackingStore::UpdateLater, QWidgetBackingStore::BufferInvalid);
+    } else {
+        tlwExtra->backingStoreTracker->markDirty(clipped, q,
+            QWidgetBackingStore::UpdateLater, QWidgetBackingStore::BufferInvalid);
+    }
 }
+// Needed by tst_QWidget
+template Q_AUTOTEST_EXPORT void QWidgetPrivate::invalidateBackingStore<QRect>(const QRect &r);
 
 void QWidgetPrivate::repaint_sys(const QRegion &rgn)
 {
diff --git a/src/widgets/kernel/qwidgetbackingstore_p.h b/src/widgets/kernel/qwidgetbackingstore_p.h
index 53ccda850a..4d15ab138e 100644
--- a/src/widgets/kernel/qwidgetbackingstore_p.h
+++ b/src/widgets/kernel/qwidgetbackingstore_p.h
@@ -118,10 +118,8 @@ public:
         return !(dirtyWidgets.isEmpty() && dirty.isEmpty() && dirtyRenderToTextureWidgets.isEmpty());
     }
 
-    // ### Qt 4.6: Merge into a template function (after MSVC isn't supported anymore).
-    void markDirty(const QRegion &rgn, QWidget *widget, UpdateTime updateTime = UpdateLater,
-                   BufferState bufferState = BufferValid);
-    void markDirty(const QRect &rect, QWidget *widget, UpdateTime updateTime = UpdateLater,
+    template <class T>
+    void markDirty(const T &r, QWidget *widget, UpdateTime updateTime = UpdateLater,
                    BufferState bufferState = BufferValid);
 
 private:
@@ -305,7 +303,7 @@ private:
     friend class QWidget;
     friend class QBackingStore;
 
-    Q_DISABLE_COPY(QWidgetBackingStore)
+    Q_DISABLE_COPY_MOVE(QWidgetBackingStore)
 };
 
 QT_END_NAMESPACE