As a user, I want to see when a task is being marked/unmarked as blocking another task, and receive the corresponding notification if I'm subscribed.
Currently only the blocked task logs the action and notifies.
Steps to reproduce:
- create ticket T1
- create T2
- open the page for T1, click "edit blocking tags"
- add T2 as blocker
Expected results: there will be a record on the T1 page telling who and when added the blocker, and a similar record on the T2 page for the dependency.
- T1 logs "(someone) added a blocking task: T2:...". A notification is created
- However, T2 doesn't log anything and its subscribers will miss the event.
The same happens when removing blocking tasks.
Original report: https://phabricator.wikimedia.org/T76556