diff -r 41300fa6a67c -r 2f34d5167611 src/gui/painting/qwindowsurface_s60.cpp
--- a/src/gui/painting/qwindowsurface_s60.cpp	Tue Feb 02 00:43:10 2010 +0200
+++ b/src/gui/painting/qwindowsurface_s60.cpp	Fri Apr 16 15:50:13 2010 +0300
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
@@ -145,10 +145,23 @@
 
 void QS60WindowSurface::flush(QWidget *widget, const QRegion &region, const QPoint &)
 {
-    const QVector<QRect> subRects = region.rects();
-    for (int i = 0; i < subRects.count(); ++i) {
-        TRect tr = qt_QRect2TRect(subRects[i]);
+    QWidget *window = widget->window();
+    Q_ASSERT(window);
+    QTLWExtra *topExtra = window->d_func()->maybeTopData();
+    Q_ASSERT(topExtra);
+    QRect qr = region.boundingRect();
+    if (!topExtra->inExpose) {
+        topExtra->inExpose = true; // Prevent DrawNow() from calling syncBackingStore() again
+        TRect tr = qt_QRect2TRect(qr);
         widget->winId()->DrawNow(tr);
+        topExtra->inExpose = false;
+    } else {
+        // This handles the case when syncBackingStore updates content outside of the
+        // original drawing rectangle. This might happen if there are pending update()
+        // events at the same time as we get a Draw() from Symbian.
+        QRect drawRect = qt_TRect2QRect(widget->winId()->DrawableWindow()->GetDrawRect());
+        if (!drawRect.contains(qr))
+            widget->winId()->DrawDeferred();
     }
 }