I don't see any recent changes to AbuseFilter that explain this... perhaps it's a larger issue, or AbuseFilter needs updating following some recent change to OOUI?

The error traces back to https://gerrit.wikimedia.org/g/mediawiki/extensions/AbuseFilter/+/cdee6802ea2bc5a6c66534f929b08ae97d9c9a7f/modules/ext.abuseFilter.edit.js#447

There we are passing in $( '#mw-abusefilter-warn-preview-button' ) but this element isn't on the page. So the issue must be with whatever populates the "Actions to take" section of the form.

I think it might be due to this commit https://github.com/wikimedia/mediawiki-extensions-AbuseFilter/commit/b9e4475985b04255c18953fd0a0cd094e1a70b11#diff-7b91fe952ae15c62842be2a75267f75d

We're missing any form element under "Actions to take" that isn't already set. For instance see https://meta.wikimedia.org/wiki/Special:AbuseFilter/145, the "Prevent the user..." checkbox is there, but not any other options. Meanwhile https://meta.wikimedia.org/wiki/Special:AbuseFilter/147 doesn't currently have any actions set, so we don't see any form elements.

@Daimona Perhaps we could revert that commit for the time being?

Ouch! I'm going to hotfix that - no need to revert that commit in its entirety. I'll also add a selenium test for actions. I think this should be a train blocker given that the form is unusable no matter what.

Change 545617 had a related patch set uploaded (by Daimona Eaytoy; owner: Daimona Eaytoy):
[mediawiki/extensions/AbuseFilter@master] Unbreak filter edit form

https://gerrit.wikimedia.org/r/545617

Let's hold the train but not roll back for now.

Yeah no need to rollback, for sure. The fix is also pretty small and self-contained.

Change 545620 had a related patch set uploaded (by Daimona Eaytoy; owner: Daimona Eaytoy):
[mediawiki/extensions/AbuseFilter@wmf/1.35.0-wmf.3] Unbreak filter edit form

https://gerrit.wikimedia.org/r/545620

Change 545617 merged by jenkins-bot:
[mediawiki/extensions/AbuseFilter@master] Unbreak filter edit form

https://gerrit.wikimedia.org/r/545617

Sorry, don't have time to deploy this right now; can someone else take this? Otherwise will be back around in ~4 hours' time.

I intended to deploy, but:

• held off per SRE as error traffic has been high.
• I lack permission to edit/create filters at https://en.wikipedia.org/wiki/Special:AbuseFilter/new for testing purposes.

In T236286#5600224, @brennen wrote:

I intended to deploy, but:

• held off per SRE as error traffic has been high.
• I lack permission to edit/create filters at https://en.wikipedia.org/wiki/Special:AbuseFilter/new for testing purposes.

Only groups 0-1 are affected right now, so enwiki is fine. If you browse to https://test.wikipedia.org while logged in, your account there will be auto-created, and I can make you a sysop if you'd like, so that you can test it too.

Only groups 0-1 are affected right now, so enwiki is fine.

Heh, right. Sorry, was not thinking clearly here.

If you browse to https://test.wikipedia.org while logged in, your account there will be auto-created, and I can make you a sysop if you'd like, so that you can test it too.

Sounds good, and I think we're clear to proceed.

Change 545620 merged by jenkins-bot:
[mediawiki/extensions/AbuseFilter@wmf/1.35.0-wmf.3] Unbreak filter edit form

https://gerrit.wikimedia.org/r/545620

Mentioned in SAL (#wikimedia-operations) [2019-10-23T22:55:53Z] <brennen@deploy1001> Synchronized php-1.35.0-wmf.3/extensions/AbuseFilter: SWAT: [[gerrit:545620|Unbreak filter edit form (T236286)]] (duration: 01m 05s)

Thank you!