f6c41a54b9
This fixes a bug where this used to happen:
* Alice has not read a message
* Bob edits the message
* Alice immediately reads the message
* Bob's edit arrives to Alice and sets her
message status back to unread
Essentially, the root cause of the bug is that we update
message.unread for edits, possibly from stale data, even
though Alice has more current info about reading the message.
This is the final fix to that scenario. There were some
aggravating factors that widened the race window which were
fixed in earlier commits.
Fixes #6248
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 300 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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