PopupTagMultiselectWidget is from UX perspective inferior to MenuTagMultiselectWidget:
- Inputs shouldn't be part of tooltip like popups,
- Tabbing through form is surprisingly going to a popup and not to the input field as user would expect,
- Popup doesn't disappear when tabbing out and
- Popup alignment and inner padding is unorthodox
It should be deprecated, replaced where necessary and removed from the core library.
Currently, according to [[ https://codesearch.wmflabs.org/search/?q=PopupTagMultiselectWidget&i=nope&files=&repos= | CodeSearch it's only used ]] in #mediawiki-extensions-apisandbox in Foundation products.
[x] Deprecate PopupTagMultiselectWidget
[] Replace all use cases with MenuTagMultiselectWidget, alternatively move it to own core widget
[] Remove PopupTagMultiselectWidget