This diff fixes messages appearing unread by adding a timestamp check when getting new messages.
https://linear.app/comm/issue/ENG-9727/thick-threads-appearing-unread
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When @kamil was working on D13576, we had a discussion about this logic.
What is our thinking about this now?
We're mitigating the risk of messages being delivered in the wrong order (I think so):
User A receives a message from user B, then reads the message and we have a timestamp T1. Then receive a message from user C with a timestamp lower than T1 (this is something really possible to happen in the P2P world), we want to bump the unread status anyway. The philosophy behind that was that it's better to have unread even if we saw all the messages, than not having unread when new messages are there.
Separately, setting @tomek as blocking as he originally decided on this logic.
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What is our thinking about this now?
Currently, there's no single best solution. Even when we show a thread as unread, the delivered message could be quite old, and a user isn't able to easily tell which message is the new one. So both solutions are far from ideal. We could consider moving read status to a message level, but that would be a separate project.