Notifications about post changes are useful, as is the edit history, but neither of these things is well cordinated with the other activity on posts.
I would suggest adding a TA bot user that posts in the room chat when activities happen on a post.
> User C posted new answer.
> User M flagged answer.
> User A edited answer.
> Unel N counter-flagged answer.
Having these interspersed with other chat messages (that may or may not give further clues as to what inspired changes) would much more useful that the flat display currently available (especially for flaggers) that reveals nothing about when or why they took the action of flagging.
I would suggest this completely replace the current system of showing avatars of flaggers under the question where –to my eyes– it still looks like that is some sort of endorsement.
I'm marking this as `wont-fix` for now.
In practice, the chat transcript isn't very connected with the Q&A, and that is by design. Q&A post history should be completely independent of the comments, which are just transient (albeit permanently available in archive form in the transcript) conversations around improving posts.