I'm looking for a vanilla plugin that will allow users to edit each other's comments. User A comments on a discussion, User B sees the comment, thinks he can improve it and edits User A's comment. User A gets a notification in his profile + an email showing him what User B changed. User A can allow or disallow the change.
A change history should also be available to User A in his profile and an option to show change history to users in the discussion.
On the discussion, under the comment I would like to display the avatar for each user that made any changes and when clicked, it would highlight what that user contributed.