Feature idea: Notification when a parent comment is modified

Not sure how many people would consider this feature useful: Imagine that you reply on someone else’s comment, and the person edits their comment later. I think it might be useful (perhaps depending on circumstances) to get a notification.

Notification “XY edited a comment you replied to” should appear at the same place as when you get a reply. In perfect case, the tooltip would highlight the difference between the original and the updated comment.

Use cases that I imagine:

  • Person A makes a comment. Person B makes a reply disagreeing with the original comment. Upon reading this, person A changes their mind and updates the original comment like this: “[EDIT: Actually, B makes a good argument against]”. This feature would show this information in person B’s inbox, without A having to write a separate reply to their comment.

  • Person A makes a comment. Person B makes a disagreeing reply. Person A silently updates their original comment to make B’s response seem silly.

This feature would apply only to comments that reply to comments, i.e. not to the top-level comments, because I assume that minor modifications of articles are sometimes too frequent (and would flood the inboxes of top-level commenters), and because more people would notice a substantial stealthy article edit.

An argument against this feature is that some people can make frequent insubstantial edits to their comments (e.g. fix typos), which also could flood the inboxes of the repliers. Then this feature would be annoying. Possible solutions:

  • Multiple unread notifications for the same comment are merged into one.

  • Some heuristic (e.g. only punctuation or isolated words are modified) to detect insubstantial edits.

  • Or an opposite solution (covering only the first use case), where a heuristic would identify substantial edits (e.g. where the added text contains a word like “edit”, “update”, “change”, “modify”, “remove”, “delete”).

Your opinions?