Steve Howell f6c41a54b9 Avoid overwriting message.unread for message edits. ...

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

2017-12-26 09:01:21 -05:00

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