[PATCH] fix kwin passive grab leaks

[Dirk Mueller]

Hi, 

xrestop pointed out a massive ressource leak in kwin. it seems that on each 
kwin-relevant action (like switching focus, switching desktop), passive grabs 
are pooled, slowing it down and eating memory. 

Below is the patch. I'm not entirely sure why it is necessary, since 
XGrabButton manpage states that it would undo all passive grabs which were 
done before. Apparently it doesn't do that. Maybe its a X11 bug, only god 
knows. 

Reproducable on SuSE9 and confirmed to exist on Debian unstable by Simon. 

Please review. 


Dirk
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