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Replace jquery.mwCoolCats with mediawiki.widgets.CategorySelector

Authored by matmarex.

Description

Replace jquery.mwCoolCats with mediawiki.widgets.CategorySelector

It offers a much prettier and much more usable user interface.
See the task for screenshots.

Notable improvements:

  • No longer makes users want to claw their eyes out.
  • Every category is now linked to its description page, with the link color correctly reflecting page existence, which is much closer to MediaWiki and HotCat interfaces users are familiar with.
  • Improved warning message about using non-existent categories is displayed on hover and immediately after a category is added.
  • Categories that were preset or copied from first upload's details behave consistently with newly typed ones (rather than a mixture of input fields and removable capsules).

Depends on I66e603fd45b8d3fd61618f9115cd031f6fa01e9d in MediaWiki core.

Bug: T112764
Change-Id: I14bd22b50170f1954bb908dadcf4b07ab5d48c20

Details