http://bugs.winehq.org/show_bug.cgi?id=23180
--- Comment #15 from Dmitry Timoshkov dmitry@codeweavers.com 2010-06-25 07:01:48 --- (In reply to comment #14)
As far as Metacity and Fluxbox are concerned: yes. But the problem is with KWin, where the X is missing after the child window closes. So is it their bug, not Wine's?
Yes, that sounds like a KWin bug.