Allow external destination when preserve_destination enabled

Hello,

I have a problem with this module when I have a multilingual installation with different domains. This module checks if a URL is external and then disables 'preserve_destination'. It's the right solution but not very user-friendly. External redirects to internal domains can be enabled with a patch from issue https://www.drupal.org/project/drupal/issues/2643466 🐛 Use TrustedRedirectResponse Error on Multilingual Setup Needs work , and we can use the same method to detect. Obviously, the core patch must land first; until then, we need to postpone.