As a user who has watchlisted a page, I want to be able to choose whether or not to automatically watchlist each new topic.
Background: the current configuration, for a page that I've watchlisted, is to only send a notification, and only add a single watchlist item, for the creation of a new topic; not for subsequent posts in that topic, unless/until I manually watchlist that topic.
Expected: To have a selection system when watchlisting a page (if either or both of the page/talkpage are flow-enabled), giving me options for how I want to receive updates to that flow board(s).
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There are many related comments and tasks, in:
* {T100528}
* {T104323}
* {T62723}
* and possibly others in the tracking task.
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(I also made one-possible very rough napkin sketch about this: {F3065631}
Mostly just to trigger further thought/discussion/design, not as a mockup or final proposal! There are edge-cases to consider, and other dreams to add/enhance it with.)