This ticket is part of the EPIC T383055
Background
The Commons categorization principle suggest that: "The page (file, category) should be put in the most specific category/categories that fit(s) the page (not directly to its parent categories)"
However, the current categories field in the upload wizard does not facilitate that. This ticket is to allow users to navigate to subcategories thereby allowing them to discover and choose more specific category in the autocomplete list.
Acceptance criteria
Initial autocomplete list
- an arrow should be appended to parent category names in autocomplete list to indicate there are subcategories as shown in the mock below
- append the Ascii Rightwards Arrow →
- make sure the RTL interface uses the Leftwards Arrow ← - can't be tested until the relevant patch is merged. It's implemented in messages, so RTL ones aren't yet translated
- the parent category name in the autocomplete list will take users to a list of subcategories
 |  |
Subcategory list
- once on the subcategory list, users can go back to the previous list using the "Leftwards arrow" as shown in the mock below.
- make sure the RTL interface users "Rightwards Arrow" to go back to previous list - can't be tested until the relevant patch is merged. It's implemented in messages, so RTL ones aren't yet translated
- the parent category name will be shown at the top as shown in the mock below - name in normal weight instead of bold, and PARENT CATEGORY (smaller, capitalized) instead of (parent category)
- clicking on the parent category name or other category names will input that category in the input box
and close the menu- we decided to leave the menu open - users can continue to traverse down to any further sub categories following the same structure as above
 |  |
Not included in this ticket
- Showing a full list of sub categories would require additional interactions such as adding the ability to scroll within autocomplete list which will be covered in a separate ticket - T383721
