Merge branch 'qt-master-from-4.7' of scm.dev.nokia.troll.no:qt/qt-integration into master-integration

* 'qt-master-from-4.7' of scm.dev.nokia.troll.no:qt/qt-integration:
  Clear WSERV content when a native child receives an "expose"

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/kernel/qapplication_s60.cpp b/src/gui/kernel/qapplication_s60.cpp
index 0c4b307..7f157a1 100644
--- a/src/gui/kernel/qapplication_s60.cpp
+++ b/src/gui/kernel/qapplication_s60.cpp
@@ -1071,6 +1071,14 @@ void QSymbianControl::Draw(const TRect& controlRect) const
     Q_ASSERT(topExtra);
     if (!topExtra->inExpose) {
         topExtra->inExpose = true;
+        if (!qwidget->isWindow()) {
+            // If we get here, then it means we have a native child window
+            // Since no content should ever be painted to these windows, we
+            // erase them with a transparent brush when they get an expose.
+            CWindowGc &gc = SystemGc();
+            gc.SetBrushColor(TRgb(0, 0, 0, 0));
+            gc.Clear(controlRect);
+        }
         QRect exposeRect = qt_TRect2QRect(controlRect);
         qwidget->d_func()->syncBackingStore(exposeRect);
         topExtra->inExpose = false;