frame: Protect XShape requests
Bug: 16383
If the window has vanished, the XShape request will fail.
Make sure all XShape requests are protected by error traps.
Signed-off-by: 
Olivier Fourdan <fourdan@xfce.org>
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Bug: 16383
If the window has vanished, the XShape request will fail.
Make sure all XShape requests are protected by error traps.
Signed-off-by: Olivier Fourdan <fourdan@xfce.org>