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chatsync: fixed delayed messages during reconnect catch-up - #140
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Some comments, for PRs like this a bit more description would really help to understand it. As-is I really don't have much an idea of what the change is attempting.
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When xchat reconnects, it may need to backfill missed messages while disconnected while live messages are waiting to be sent.
Previously, the behavior was to backfill every chat before delivering any new messages when xchat got disconnected, so a message could be delayed by the backfill from other chats.
This PR changes the behavior to prioritize live messages over backfilling for missed messages between reconnect.
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