http://bugs.winehq.org/show_bug.cgi?id=27522
--- Comment #5 from Fab netfab@gmail.com 2011-06-22 05:42:13 CDT --- In fact, my previous comment is partially wrong.
in real fullscreen --> always happens, even if capture-the-mouse is unchecked. in virtual desktop --> happens only if capture-the-mouse is checked.