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Convert DropdownInputWidget of Special:ActiveUsers to a multi-select widget
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The two checkboxes of Special:Activeusers were converted to a dropdowninput widget as a result of T116354: Special:ActiveUsers' user interface is awkward (can't filter to arbitrary user groups). However, there are legitimate use cases where a user may wish to select multiple user groups (e.g. sysop and stewards or some other combination). This is currently not possible.

This task should work out a way how this could be implemented, e.g. by using one of the (not yet created) multi-select widgets of OOJsUI:

Event Timeline

What you want already exists in HTMLForm (although not in its OOUI version). Just use a HTMLMultiSelectField and add 'cssclass' => 'mw-chosen' to it. This will magically turn the usual checkboxes into a Chosen selector (which is pretty much the same thing as OOjs UI's CapsuleMultiSelectWidget). It's used in the OpenStackManager extension, for example on Special:NovaServiceGroup (no uses in core right now, though).

No JS:

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With JS enabled:

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I see one problem with that JS option: you need to know what you are looking for before typing. :)

I think it will actually show the whole list of available options when
you click the field (like HTML <select> dropdown boxes).

Yep, it should show the whole list when clicking into the input and filter it when typing :)

I implemented this in the last patchset of Let's merge this back into the original task.