Having checked this out, I can see that $wgRestrictDisplayTitle does allow some but not all of this functionality. That is, it allows changes to both the displayed name and <title> but you have to use one string to change both values. So, if you set {{DISPLAYTITLE:USS ''Nimitz''}}, it changes the page title to USS Nimitz (italics with <i> tags), but then the html title is displayed as USS Nimitz (without the formatting), and it's not ideal to set the <title> tag to something different such as USS 𝘕𝘪𝘮𝘪𝘵𝘻 (which uses italic lettering from https://lingojam.com/ItalicTextGenerator rather than formatting the text itself). Note, if you use {{DISPLAYTITLE:USS 𝘕𝘪𝘮𝘪𝘵𝘻}} (i.e. with the italic lettering), the page title looks pretty messy.

@taavi I do not think this is an extension request; I think it better integrated into MediaWiki core.

Thanks for the review @Samwilson - you are correct; I had misspecified the element that this would customise.

I don't think we should really be using italics to show redirects.

Might it be better to fix this with a magic word like` {{ISSUBPAGE}} which would return 1` if true and 0 if false? They could then be used together to avoid throwing errors.

Is this really a massive 😱 OMG drop everything and panic security issue?

The solution to this, which I'm going to suggest, is by moving disambiguation pages to their own namespace. This is something that some 3rd party wikis do already, and it seems to work.

I think this is good idea 👍💡

There is also

Related, prevention is better than cure - T326056 would discourage users from creating double redirects by first checking to see if the redirect target is itself a redirect. But maybe a belt and braces approach is required.

Novem Lingua, might you have the chance to look at this one? It seems straightforward.

Respectfully cc Bartosz because he fixed tables of contents in [[Special:Version]] and [[Special:SpecialPages]]

What happened here with https://gerrit.wikimedia.org/r/c/449689 ?

I think this is a duplicate of T22858.

What is "the ellipsis button"?

But wrapping plain text in <pre> tags would now display it in monospaced font, right?

OK, so in includes/category/CategoryViewer.php there are these lines, which might mean something to some people:

Hi Celess22, thanks for the comment.