present: fix bad logic in cancelling scheduled operations.
If we present several pixmaps in advance for different msc, the later one shouldn't cancel the previous ones. This reverts a change made by commit e6f5d9d7 Without this fix, vblank_mode=0 glxgears doesn't update with the present fallback. Signed-off-by: Axel Davy <axel.davy@ens.fr> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com>
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