compositor: Use a fence to sync X and GL
Bug: 13519
Use a fence to prevent the pixmap updates to be picked up before
being complete, which causes visual glitches and blinking.
Signed-off-by: 
Olivier Fourdan <fourdan@xfce.org>
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Bug: 13519
Use a fence to prevent the pixmap updates to be picked up before
being complete, which causes visual glitches and blinking.
Signed-off-by: Olivier Fourdan <fourdan@xfce.org>