present: Don't abandon presents which are already queued for flip
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>
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@ -689,6 +689,9 @@ present_pixmap(WindowPtr window,
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if (!vblank->pixmap)
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continue;
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if (!vblank->queued)
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continue;
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if (vblank->crtc != target_crtc || vblank->target_msc != target_msc)
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continue;
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