The values in Discourse dropdown menus only come from admin-defined strings, not unsanitised end-user input, so this lack of escaping was not exploitable.
Major changes included:
- better support for screen readers
- trapping focus in modals
- better tabbing order in composer
- alerts on no content found/number of items found
- better autofocus in modals
- mini-tag-chooser is now a multi-select component
- each multi-select-component will now display selection on one row