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When a flip (or unflip) is pending and a flip request comes in, leave it queued until the pending flip completes and then execute it. This fixes a bug where an application submitting back-to-back present_pixmap requests for sequential frames would alternate between flipping and copying as the pending flip would cause the new present_pixmap request to not use a flip. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Tested-by: Frank Binns <frank.binns@imgtec.com>