[Bug 35863] ddraw tests sometimes fail to receive their messages

https://bugs.winehq.org/show_bug.cgi?id=35863

--- Comment #1 from Henri Verbeet  ---
Can you reliably reproduce this? I've seen this happen on occasion, but not
often enough to really investigate. What I suspect is happening is that the
SendMessageTimeoutW() call in X11DRV_resize_desktop() aborts/times out because
we're busy changing the display mode.