Location search when adding a custom notification filter doesn't work

Steps to reproduce:

• on a user profile, go to the notification tab
• in the "Custom filters" section, click "Add filter"
  • the add filter dialog is displayed
• in the add filter dialog, for the location selector, a search box is displayed
• type some search string in that box that has results on the (current) wiki (for example, "Sandbox", in my case)
• the magnifier icon from the search box changes into a spinner for a short while and then comes back to magnifier

Expected result:

• the search results matching the search string should be somehow be highlighted in the location tree under or otherwise displayed to the user to choose from

Actual result:

• nothing happens after the finish of the 'loading' of search results: the results aren't displayed anywhere - see the attached video

Note: because of this not working, the only way in which a user can select locations for a filter is by navigating the tree manually. This kind of navigation is practically impossible for a medium to large wiki, so this feature of adding a filter, for those cases, is only usable for the toplevel pages in the tree.