Setting null region for window mask kills wine 20050112

[Kuba Ober]

Hi,
I was testing my Qt 3.3.4 application with wine, and it appears that setting a 
null widget mask via QWidget::setMask(QRegion()) puts wine into an endless 
loop. It continuously spews complaints that it ran out of gdi heap. I can 
reproduce it at home and send the actual error message if need be. I presume 
that this could be reproduced with the GPL qt-win32 port, but I didn't try.
Cheers, Kuba Ober