Change 946545 had a related patch set uploaded (by Tchanders; author: Tchanders):

[mediawiki/core@master] Disallow hiding temporary users via blocks

https://gerrit.wikimedia.org/r/946545

Change 946545 merged by jenkins-bot:

[mediawiki/core@master] Disallow hiding temporary users via blocks

https://gerrit.wikimedia.org/r/946545

@Tchanders Do we want validation in the case a user has disabled JS?

They can submit the form with the hideuser checkbox checked and this is what they see:

Also, if they are changing an existing block on a temp user they can check the hideuser checkbox and submit straight away without being told it won't apply.

In T343705#9133873, @dom_walden wrote:

@Tchanders Do we want validation in the case a user has disabled JS?

They can submit the form with the hideuser checkbox checked and this is what they see:

Also, if they are changing an existing block on a temp user they can check the hideuser checkbox and submit straight away without being told it won't apply.

This is behaving differently from how it behaves when an IP is entered in the form, but I'm not immediately sure why. Will look into this.

Moving to the backlog while we focus on other work

The work in this task will be undone or partially undone in T355430: Allow temporary accounts to be blocked with 'hideuser'.

In T343705#9478072, @Dreamy_Jazz wrote:

Per T355430: Allow temporary accounts to be blocked with 'hideuser'.

As a record, see rMW7440b2c22e3294d7b173202e3250c0e2c7982ebb if you can not see that task. But potentially that task should be made public.