As an editor, who is currently typing a reply to a topic, I'd like to know if someone else has saved a new post, whilst I'm typing.
This would prevent duplicate replies (as encountered [[https://en.wikipedia.org/w/index.php?title=Topic:Selbmxmvhx79462g&topic_showPostId=selix5sti9b82rir#flow-post-selix5sti9b82rir |here a few days ago]] where Matt saved a reply, whilst I was typing mine).
It would also prevent confusion, when multiple people post replies before me, but my original click on the "Reply" link came first - see T94913 for demonstration of this 'timing' problem.
Possible solutions:
* Live update
* A notification bubble, that appears when someone else replies within a topic that I'm typing in.
* A notification bubble, that appears when I click "Save", if someone else has replied whilst I was typing.
* (other?)