Race condition in poll_for_response results in event not being delivered
poll_for_response, if a event arrives after
poll_for_event and before
xcb_poll_for_reply64, that event will be read in
xcb_poll_for_reply64, but not be put into Xlib's queue. This can be a big problem if the application proceed to block on
select() because it thinks no events are available.
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