LanguageNegotiationUrl unnecessarily adds domain to outbound URL's

Thanks for reporting this!

The merge request needs to be created against 11.x (our main development branch); it will be backported to supported versions once committed to 11.x. In some cases the easiest thing to do is close the previous merge request and create a new one against 11.x. Thanks!

I've added test coverage.

As a bonus, it turns out that we've fixed, at least partially, a bug stated in 🐛 Domain-based language negotiation strips "destination" URL query argument, causing BigPipe error Closed: duplicate , so I have had to change a line in BlockUiTest too.

smustgrave → closed merge request !6833

Left 1 small comment on MR

If you are another contributor eager to jump in, please allow the previous poster at least 48 hours to respond to feedback first, so they have the opportunity to finish what they started!

Thanks! I've replied to your comment in the MR.