Here's a perhaps surprising place to see it in action:

Special:Block

In T232688#5486127, @Krinkle wrote:

Here's a perhaps surprising place to see it in action:

Special:Block

Wow. Yeah, that's a serious anti-feature.

Change 536543 had a related patch set uploaded (by Krinkle; owner: Fomafix):
[mediawiki/core@master] Integrate module 'jquery.checkboxShiftClick' into 'mediawiki.page.ready'

https://gerrit.wikimedia.org/r/536543

Change 536543 merged by jenkins-bot:
[mediawiki/core@master] Integrate module 'jquery.checkboxShiftClick' into 'mediawiki.page.ready'

https://gerrit.wikimedia.org/r/536543

I don't think we should remove this feature. There are certainly parts of MediaWiki where it is not helpful (like the block interface), and parts where we implemented more clever interfaces (e.g. the search page used to have a huge block of checkboxes for namespaces), but there are others where it is useful, for example the revision deletion/undeletion interface.

In T232688#5512034, @matmarex wrote:

I don't think we should remove this feature.

"…from default payload", not from MW. Presumably we'd still load it on a few special pages like delete/undelete, which is what it was meant for.

The "Remove the feature entirely?" in task description suggest that removing it was considered as an option and I wanted to make sure you don't do that.

From my perspective as the PM on Anti-Harassment which is currently responsible for Special:Block, I do not mind if we remove it from that page. It was not an intentional feature.

I'd like to ask our users via Tech-News whether they are aware of any places (apart from Special:Undelete) where our checkbox-shift code is currently working in a way that they find useful. It is my expectation that this is most likely unexpected and/or actively causing bugs or other mistakes. For those cases, removing the code will improve the experience. If there are cases where this code is (accidentally) working correctly, then I need to know about it. It is no problem to keep loading it in a small number of cases.

Proposed text for Tech News:

In T232688#5830856, @Krinkle wrote:

I'd like to ask our users via Tech-News whether they are aware of any places (apart from Special:Undelete) where our checkbox-shift code is currently working in a way that they find useful.

It is very useful on Special:Contributions and action=history for revision deletion.

Anywhere where revision deletion or suppression could be used, it'd be useful, in particular I'm thinking of Special:Log. It's useful on Special:Nuke as well. I'm not sure it's needed on Special:UserRights, although it would make removal of redundant rights after getting sysop easier, albeit rare.

action=history is correct @JJMC89, but I believe the checkboxes on Special:Contribs are due to a userscript. Still, if T78092 ever happens, it'd be needed for sure. Likewise, on Special:DeletedContributions (T121297) and the AbuseLog (T144096).

In T232688#5832501, @Amorymeltzer wrote:

I believe the checkboxes on Special:Contribs are due to a userscript.

Oh, you're right.

It is also very useful on Special:EditWatchlist.

Trying to find a better tag for this. The MediaWiki-User-Interface tag is too generic. Open to better ideas.

This task is not about an issue with the delivery system, nor with a core module maintained as part of ResourceLoader (see Phab project description). I tagged MW-UI since this is a core module provided by OutputPage or Skin.

However, part of my proposal is to not make it be that anymore, but rather localise it to HTMLForm, or even embed it directly in the Page-delete and User-block features respectively (no re-use needed).