Incorrect Redirect Success URL generated on multilingual site with translated custom controller

Added an issue fork with a possible solution?
The request is redirected back to the original domain on a finalRedirect multi_domain_login route to handle the URL generation on the original domain.

shamrockonov → changed the visibility of the branch 1.0.x to hidden.

Not sure I like the additional redirect really. Open to suggestions.

Hi, if I understand correctly you have:

Language negotiation on domain level set to:
www.dutch.com => NL (alternative language)
www.english.com => EN (default language)

You have a custom controller route:
/some/controller/english

A path alias:
/some/controller/english => /some/controller/dutch (langcode NL)

Multidomain success url is set to:
/some/controller/english

When you login from EN domain you get:
www.english.com => www.dutch.com => www.english.com/some/controller/english

When you login from NL domain you get:
www.dutch.com => www.english.com => www.dutch.com/some/controller/english

But you expected:
www.dutch.com => www.english.com => www.dutch.com/some/controller/dutch

Correct?

I added the langcode of the original referrer route to be passed along the login chain so that in the end the redirect url can be translated into this language. This eliminates the extra redirect.

kriboogh → credited mschudders → .