Function wait_for_framebuffer 

fn wait_for_framebuffer(
    fb: &SharedFramebuffer,
    pace: &FramePace,
    period: Duration,
) -> TickTrigger

wait_for_frame on a shared framebuffer’s watch (framebuffer): a drawing operation the server signals on it ends the wait as a reported change would, with no round trip, and so does a resize retiring it.