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[Backport to xserver-21.1] present: Send a PresentConfigureNotify event for destroyed windows

This enables fixing a deadlock case on the client side, where the client ends up blocked waiting for a Present event that will never come because the window was destroyed. The new PresentWindowDestroyed flag allows the client to avoid blocking indefinitely.

Signed-off-by: Adam Jackson See-also: mesa/mesa#116 (closed) See-also: mesa/mesa#6685 (closed) Reviewed-by: Michel Dänzer (cherry picked from commit 462b0603)

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