http://bugs.winehq.org/show_bug.cgi?id=22927
--- Comment #6 from Wylda wylda@volny.cz 2010-06-01 10:56:54 --- Created an attachment (id=28494) --> (http://bugs.winehq.org/attachment.cgi?id=28494) 2nd screen shot
... when I use 'Alt-Tab' there is one instance running without a window.
Still can't confirm for KDE v4.4.3. See my screen shot... But i noticed, that there is <2> which looks like KDE recognize, that there are two windows and virtually merge them (just speculation!). I don't see <2> in any other cases, only with TheBat.