Presents which are not marked 'queued' and are in the window present
list are waiting for the flip event; discarding those won't work very
well (it'll end up trashing displayed content for the next frame), so
skip over those when looking for duplicate frame presents
Signed-off-by: Keith Packard <keithp@keithp.com>
if (!vblank->pixmap)
continue;
+ if (!vblank->queued)
+ continue;
+
if (vblank->crtc != target_crtc || vblank->target_msc != target_msc)
continue;