PATCH: fix for #44133

[Lubos Lunak]

 Hello,

 please somebody review this patch :)  :

 The patch
- fixes killing (Ctrl+Alt+Esc) windows with override-redirect (which seems to 
be the case with the window in the bugreport). Windows with override-redirect 
don't have their clients, so checking the clients does the wrong thing here. 
And going up the hiearchy and checking for the possible client seem to be a 
better way of doing it anyway.
- makes the now not really fitting killWindowAtPosition() a no-op (public, but 
shouldn't be used by the clients anyway)
- renames one method to findClientWithId() in order to fix a typo (private, so 
shouldn't affect BC)

-- 
Lubos Lunak
KDE developer
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