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ace551d8a2
Completing them from xwl_present_sync_callback had at least two issues: * It was before the MSC was incremented in xwl_present_frame_callback, so the MSC value in the completion event could be lower than the target specified by the client. This could cause hangs with the Mesa Vulkan drivers. * It allowed clients to run at a frame-rate higher than the Wayland compositor's frame-rate, wasting energy on generating frames which were never displayed. This isn't expected to happen unless the client specified PresentOptionAsync (in which case flips are still completed from xwl_present_sync_callback, allowing higher frame-rates). v2: * Make xwl_present_has_events return true when there's a pending "synchronous" flip, so those complete after at most ~1 second even if the Wayland server doesn't send a frame event. Bugzilla: https://bugs.freedesktop.org/106713
X Server
The X server accepts requests from client applications to create windows,
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