T52239: VisualEditor: Allow the user to edit categories at the bottom of the page, similar to HotCat is about the UI. This is about a function:

It'd be nice if you could find a category without knowing what its name is. You can do this in HotCat, by starting with the root category (or any category) and stepping up and down through the category tree until you find the one that you want. It would be helpful if you could start in "Cagetory:People" and then go down the tree through "Category:People by occupation" and the many sub-categories until you found what you wanted.

See https://www.mediawiki.org/wiki/Topic:Tq9ooogw60uu5y07 for the initial discussion.