in multiwindow mode the modal moving/resizing of windows causes a lot of
redraw events send to the X clients after the userse releases the mouse
button. During the moving/resizing client windows are not redrawn as long as
the mouse button is pressed. But all redraw/resizing events are queued and
executed step after step after moving/resizing ends.
Some clients collect and combine multiple redraw or resizing events, other
clients (e.g. xterm) simply execute each redraw or sizing event.
The enclosed patch minimizes the events for clients to only one event after
the user releases the mouse button to end the moving/resizing. This improves
the user experience and reduces strange screen flickerings especially on slow
platforms.