diff -r 5dc02b23752f -r 3e2da88830cd src/gui/kernel/qwidget_x11.cpp
--- a/src/gui/kernel/qwidget_x11.cpp	Tue Jul 06 15:10:48 2010 +0300
+++ b/src/gui/kernel/qwidget_x11.cpp	Wed Aug 18 10:37:55 2010 +0300
@@ -1023,6 +1023,7 @@
 void QWidget::destroy(bool destroyWindow, bool destroySubWindows)
 {
     Q_D(QWidget);
+    d->aboutToDestroy();
     if (!isWindow() && parentWidget())
         parentWidget()->d_func()->invalidateBuffer(d->effectiveRectFor(geometry()));
     d->deactivateWidgetCleanup();