Support native event filters for screen events

Change-Id: If0af4544191c513e64f582cece4a453c1ab5c8e7
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Frank Osterfeld <frank.osterfeld@kdab.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>

src/plugins/platforms/qnx/qqnxscreeneventhandler.cpp

@@ -209,7 +209,11 @@ void QQnxScreenEventHandler::processEventsFromScreenThread()
 
         m_eventThread->unlock();
 
-        handleEvent(event);
+        long result = 0;
+        QAbstractEventDispatcher* dispatcher = QAbstractEventDispatcher::instance();
+        bool handled = dispatcher && dispatcher->filterNativeEvent(QByteArrayLiteral("screen_event_t"), event, &result);
+        if (!handled)
+            handleEvent(event);
         screen_destroy_event(event);
 
         m_eventThread->lock();