Fixes: NB#206365 - Device freeze if Application Crash
Fixes: NB#206365 - Device freeze if Application Crash

XRestackWindows() failed because the window list contained destroyed
windows.

 * src/mcompositemanager.cpp (MCompositeManagerPrivate::checkStacking):
   Trap X errors and requeue a checkStacking() if it failed.

nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,siraj/mcompositor,siraj/mcompositor,siraj/mcompositor,siraj/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor