diff -r 79de32ba3296 -r 89e065397ea6 src/gui/kernel/qt_cocoa_helpers_mac.mm
--- a/src/gui/kernel/qt_cocoa_helpers_mac.mm	Fri May 14 16:40:13 2010 +0300
+++ b/src/gui/kernel/qt_cocoa_helpers_mac.mm	Thu May 27 13:40:48 2010 +0300
@@ -1167,6 +1167,17 @@
     return context;
 }
 
+void qt_mac_dispatchPendingUpdateRequests(QWidget *widget)
+{
+    if (!widget)
+        return;
+#ifndef QT_MAC_USE_COCOA
+    HIViewRender(qt_mac_nativeview_for(widget));
+#else
+    [qt_mac_nativeview_for(widget) displayIfNeeded];
+#endif
+}
+
 CGFloat qt_mac_get_scalefactor()
 {
 #ifndef QT_MAC_USE_COCOA