Retry a join on invite if the response was M_FORBIDDEN #2637
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Workaround for #2634
This simply retries a join if we got a M_FORBIDDEN from joining a room we know we were invited to. This is likely due to the delay mention in the linked issue of the linked issue. We attempt to join a few times, but eventually give up if the server doesn't yield.
The full solution is to fix Synapse so that it doesn't send an invite down sync until the room is ready to be joined to.