http://bugs.winehq.org/show_bug.cgi?id=6191
------- Additional Comments From dmitry@codeweavers.com 2006-14-09 03:00 -------
Might it be that kwin or something else prohibits a window from moving its title bar out of the visible screen space?
Yes, that's a common WM behaviour. Metacity (Gnome's WM) sets same kind of restrictions to windows.