Redirect loop if front page is /user/login

[donquixote]

Steps to reproduce:

• Enable oe_authentication with forced login.
• Leave front page as "/user/login" - this is the default from core/modules/system/config/install/system.site.yml.
• Attempt to login as an inactive user, or login with a non-existent user, and have it be auto-created as inactive.

Expected:
Not sure what we expect :)

Actual:
EU Login redirects to frontpage, Drupal refuses to login the inactive user, Drupal redirects back to EU Login, EU Login redirects back to Drupal frontpage, etc.

Workaround:
As a site builder, simply avoid having front page = /user/login.

Solution:
As maintainers of this module, we simply need to push site builders to change the default front page.
Perhaps having this issue here is good enough.