Keith Packard 20bb49ae9b Present: Check for window/fence destroyed when idling pixmaps ...

A client destroying objects in the middle of an unflip can end up
having the screen flip window or fence set to NULL in the unflip
notify path. Check for these and don't try to use those objects.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

2013-11-11 15:16:15 -08:00

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