poll_for_response: Really handle xcb_poll_for_reply getting a reply.
Don't lose async replies. That's bad. `xlsfonts -l`, which uses XListFontsWithInfo, worked fine, because the _XReply path worked; that path waited for replies, rather than polling. However, XRecordProcessReplies, which does nothing but call XPending, relied on the event-handling path to process async replies, and that was busted. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=28595Signed-off-by: Jamey Sharp <email@example.com>
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