diff -rupN 1/orig/qapplication.cpp 1/new/qapplication.cpp
--- 1/orig/qapplication.cpp	Thu Dec  8 07:06:02 2011
+++ 1/new/qapplication.cpp	Thu Jan 19 09:27:43 2012
@@ -2139,9 +2139,10 @@ void QApplication::setWindowIcon(const Q
 QWidgetList QApplication::topLevelWidgets()
 {
     QWidgetList list;
-    QWidgetList all = allWidgets();
+    if (!QWidgetPrivate::allWidgets) return list;
+    QWidgetSet* set = QWidgetPrivate::allWidgets;
 
-    for (QWidgetList::ConstIterator it = all.constBegin(); it != all.constEnd(); ++it) {
+    for (QWidgetSet::ConstIterator it = set->constBegin(); it != set->constEnd(); ++it) {
         QWidget *w = *it;
         if (w->isWindow() && w->windowType() != Qt::Desktop)
             list.append(w);