Inline comment feature in todo's list view
Problem
Currently, inside of email it is possible to react without even opening the object the todo is about. This is not possible inside of gitlab itself and might speed up user's responsiveness.
Scope
- Make it possible to create a comment to react to the comment that created that todo
- Be able to see if that todo is the last comment in that discussion thread in order to verify if the user needs to read more before he/she should comment.
- Issues/merge requests/epics/commits (all places where a discussion can happen)