Adding [[Category:Foo]] in Flow board header or Flow topic summary should add it to category.
Remaining Concern (separate task T94617: Decide how to handle categories in regular posts) is:
- Category links are inactive in posts. Do we need (or have) a way to inform editors of this aspect, when they type or try-to-save a post that contains [[category:foo]] ?
Category links such as [[Category:Foo]] are invisible in Flow posts. We could either
- auto-correct them to [[:Category:Foo]] so that they are made visible;
- Or warn the user (either: when they click "save", or when they type the closing "]]") that the category link will not be visible nor have any effect.
- Or other?