--- qt-opensource-4.8.0.old/src/gui/kernel/qeventdispatcher_x11.cpp	2011-12-08 00:06:02.000000000 -0500
+++ qt-opensource-4.8.0.new/src/gui/kernel/qeventdispatcher_x11.cpp	2011-12-30 01:40:44.188018115 -0500
@@ -46,9 +46,20 @@
 
 #include "qt_x11_p.h"
 #include <private/qeventdispatcher_unix_p.h>
+#include <private/qthread_p.h>
 
 QT_BEGIN_NAMESPACE
 
+class QScopedLoopLevelIncrementer {
+    QThreadData *threadData;
+public:
+    QScopedLoopLevelIncrementer(QThreadData *threadData)
+        : threadData(threadData)
+    { ++threadData->loopLevel; }
+    ~QScopedLoopLevelIncrementer()
+    { --threadData->loopLevel; }
+};
+
 class QEventDispatcherX11Private : public QEventDispatcherUNIXPrivate
 {
     Q_DECLARE_PUBLIC(QEventDispatcherX11)
@@ -123,11 +134,16 @@ bool QEventDispatcherX11::processEvents(
                 // no event to process
                 break;
             }
-
-            // send through event filter
-            if (filterEvent(&event))
-                continue;
-
+            {
+                // Raise the loopLevel here so that deleteLater() calls in or triggered
+                // by filterEvent() will be processed in a reasonably timely manner from
+                // the main event loop.  Not raising loopLevel here may result in such
+                // deleteLater() calls not being processed until the applciation exits.
+                QScopedLoopLevelIncrementer loopLevelIncrementer(d->threadData);
+                // send through event filter
+                if (filterEvent(&event))
+                    continue;
+            }
             nevents++;
             if (qApp->x11ProcessEvent(&event) == 1)
                 return true;