--- qt-opensource-4.8.0.old/src/gui/kernel/qapplication_x11.cpp	2011-12-16 03:22:33.918428374 -0500
+++ qt-opensource-4.8.0.new/src/gui/kernel/qapplication_x11.cpp	2011-12-27 06:39:22.852191952 -0500
@@ -4244,6 +4244,12 @@ bool QETWidget::translateMouseEvent(cons
                     && (nextEvent.xclient.message_type == ATOM(_QT_SCROLL_DONE) ||
                     (nextEvent.xclient.message_type == ATOM(WM_PROTOCOLS) &&
                      (Atom)nextEvent.xclient.data.l[0] == ATOM(_NET_WM_SYNC_REQUEST))))) {
+                // As we may run through a significant number of a large class of non-MotionNotify
+                // events here, without returning to the event loop, just before processing nextEvent,
+                // pass it through QAbstractEventDispatcher::filterEvent().  Note that this issue may
+                // exist elsewhere, wherever events are compressed in a similar manner.
+                if (QAbstractEventDispatcher::instance()->filterEvent(&nextEvent))
+                    continue;
                 qApp->x11ProcessEvent(&nextEvent);
                 continue;
             } else if (nextEvent.type != MotionNotify ||