Creating a new topic with a user mention in the title ([[User:<username here>]]) does not generate a flow-mention notification. The same mention in the topic content DOES generate a flow-mention notification.
Checked in betalabs.
- New topic with [[User:username]] triggers flow-mention notification.
- Renaming a topic to a title that has [[User:username]] does not trigger flow-mention notification.
Note for testing - two cases
- a topic is non-watched and it's renamed with [[User:username]]
- a topic is watched and it's renamed with [[User:username]]
Renaming indeed won't trigger a mention notification yet. That'll come soon, though (it's introduced in T125427: Generate flow-mention for create/edit of board desc, topic, post, summary, but hasn't been merged yet)