Merge branch '4.6' of scm.dev.nokia.troll.no:qt/oslo-staging-2 into 4.6-integration

* '4.6' of scm.dev.nokia.troll.no:qt/oslo-staging-2: (42 commits)
  Cleanup after "Changed qgraphicswidget autotest to use qWaitForWindowShown"
  Cleanup after "QGraphicsWidget is painted twice on the first show"
  Changed qgraphicswidget autotest to use qWaitForWindowShown.
  Improved QTest::qWaitForWindowShown on X11.
  Stabilize tst_QGraphicsWidget::initialShow2 (new test)
  Make sure we define S_IFDIR on Windows
  Fix copy/pasto
  Crash when closing any top-level widget on Symbian.
  Cache the sizes of the images in an animated GIF.
  Fix the QAbstractSlider autotest.
  Use OpenVG scissor on 90/180/270 rotations and simple clips.
  Optimize single-rect IntersectClip in OpenVG using the scissor
  QGraphicsWidget is painted twice on the first show.
  Compiler warning in QAbstractSlider.
  Optimize QPathClipper::pathToRect.
  QGraphicsScene: Use QPainter::setClipRect instead of setClipPath if possible.
  QStyleSheetStyle: Fix combinaison of border-image and border-radius
  Revert "QAbstractScrollArea: Wheel over a scrollarea that has only one horizontal scrollbar"
  Proper Fav icon is not shown, for all the links default fav icon shown
  Update changes-4.6.2.
  ...

1 files changed, 12 insertions, 1 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index ffad38b..4520a1b 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -1439,7 +1439,16 @@ QWidget::~QWidget()
     }
 #endif
 
-    if (QWidgetBackingStore *bs = d->maybeBackingStore()) {
+    if (d->extra && d->extra->topextra && d->extra->topextra->backingStore) {
+        // Okay, we are about to destroy the top-level window that owns
+        // the backing store. Make sure we delete the backing store right away
+        // before the window handle is invalid. This is important because
+        // the backing store will delete its window surface, which may or may
+        // not have a reference to this widget that will be used later to
+        // notify the window it no longer has a surface.
+        delete d->extra->topextra->backingStore;
+        d->extra->topextra->backingStore = 0;
+    } else if (QWidgetBackingStore *bs = d->maybeBackingStore()) {
         bs->removeDirtyWidget(this);
         if (testAttribute(Qt::WA_StaticContents))
             bs->removeStaticWidget(this);
@@ -6414,6 +6423,8 @@ void QWidget::setTabOrder(QWidget* first, QWidget *second)
         first = fp;
     }
 
+    if (fp == second)
+        return;
 
     if (QWidget *sp = second->focusProxy())
         second = sp;