Sometimes, another contributor reply the exact same thing just a few minutes before me, making my reply useless or even annoying (if I ping an user). Example : :fr:w:special:diff/197452297.
When I submit a reply, I would prefer to automatically check if new reply has been submitted by other users and if there is, be asked for confirmation.
Support.
However, IIRC this suggestion has been made already and it has been discontinued to avoid confusion of less experienced users. Perhaps an expert mode for tough users would be required.
It is not obvious how the author should react when such message arrives, and they might discard and loose their entire edit now.
This already exists. If someone else replies while you're typing, you'll get a "Show new comment" alert. Clicking that will reload the page and highlight the new comments in that section. If the toolbar is still turned on in the Reply tool, it will even rescue the text you've already typed.
It won't catch 100% of replies (what if they other person clicked the button only five seconds before you?), but it should catch most of them.
