Fix xrandr resize event failing on some systems

(cherry picked from commit 6ff026570d)

src/kernel/qapplication_x11.cpp

@@ -3436,6 +3436,27 @@ int QApplication::x11ProcessEvent( XEvent* event )
 	return 0;
     }
 
+#ifndef QT_NO_XRANDR
+    // XRandR doesn't care if Qt doesn't know about the widget, so handle XRandR stuff before the !widget check below
+    if (event->type == xrandr_eventbase + RRScreenChangeNotify
+	|| ( event->type == ConfigureNotify && event->xconfigure.window == QPaintDevice::x11AppRootWindow())) {
+	// update Xlib internals with the latest screen configuration
+	XRRUpdateConfiguration(event);
+
+	// update the size for desktop widget
+	int scr = XRRRootToScreen( appDpy, event->xany.window );
+	QWidget *w = desktop()->screen( scr );
+	QSize oldSize( w->size() );
+	w->crect.setWidth( DisplayWidth( appDpy, scr ) );
+        w->crect.setHeight( DisplayHeight( appDpy, scr ) );
+	if ( w->size() != oldSize ) {
+	    QResizeEvent e( w->size(), oldSize );
+	    QApplication::sendEvent( w, &e );
+	    emit desktop()->resized( scr );
+	}
+    }
+#endif // QT_NO_XRANDR
+
     if ( !widget ) {				// don't know this windows
 	QWidget* popup = QApplication::activePopupWidget();
 	if ( popup ) {
@@ -3486,26 +3507,6 @@ int QApplication::x11ProcessEvent( XEvent* event )
     }
 #endif
 
-#ifndef QT_NO_XRANDR
-    if (event->type == xrandr_eventbase + RRScreenChangeNotify
-	|| ( event->type == ConfigureNotify && event->xconfigure.window == QPaintDevice::x11AppRootWindow())) {
-	// update Xlib internals with the latest screen configuration
-	XRRUpdateConfiguration(event);
-
-	// update the size for desktop widget
-	int scr = XRRRootToScreen( appDpy, event->xany.window );
-	QWidget *w = desktop()->screen( scr );
-	QSize oldSize( w->size() );
-	w->crect.setWidth( DisplayWidth( appDpy, scr ) );
-        w->crect.setHeight( DisplayHeight( appDpy, scr ) );
-	if ( w->size() != oldSize ) {
-	    QResizeEvent e( w->size(), oldSize );
-	    QApplication::sendEvent( w, &e );
-	    emit desktop()->resized( scr );
-	}
-    }
-#endif // QT_NO_XRANDR
-
     switch ( event->type ) {
 
     case ButtonRelease:			// mouse event