Support path aliasing for sitmemap paths

Sitemap paths are not your regular paths. They are purposefully not normalized (you can't visit a localized version of the path) and there has never been a plan to support aliases. Since sitmemaps are supposed to be ingested by bots, their URLs don't matter to most.

I haven't had a look, but how are you adding the aliases BTW?

I don't plan on testing and implementing this, but feel free to try convincing me by creating a merge request.

As with close to all the issues you've ever submitted, I wouldn't classify this as a bug from the get-go. XD

The alias was added through the normal path alias interface: /admin/config/search/path/add

Non-normalized paths make SEO consultants cry ;-)

While I understand that "sitemap.xml" is a standard path for scanner tools to load, the files loaded within that file, i.e. the site variant paths, have no such requirement. Drupal will load the sitemap variant with the aliased paths, but the index ignores this and uses the system path. While you consider this to be a feature request because you purposefully built it this way, I was unaware this was a purposeful choice so deemed it a bug as the expected behavior in Drupal is that all rendered paths use the alias if one is present.

I'll work on a fix :p for this tomorrow.

How about this? It adds an option under the advanced settings that allows the sitemap URLs to be passed through the site aliases system. It defaults to off to avoid surprises for existing sites. Also the settings field warns against using it when using multiple languages, which triggered the original bug that lead to this change in the first place.

Having a setting that breaks one thing in order to allow something else is not an ideal situation. We turned off path processing in order to remove language prefixed paths. Instead of having two half-solutions, we should find a way to disable these language prefixes without breaking aliases. I'll be honest with you, it will have to be a quite clean solution to land. If you are still willing to look into it, thanks and good luck! Otherwise, this is quite niche so it's not at the top of my priority list.