To Reproduce Steps to reproduce the behavior:

• configure Horizon to use OIDC auth method and multi-region: 

  WEBSSO_ENABLED = True
  WEBSSO_CHOICES = (
      ("credentials", _("Keystone Credentials")),
      ("oidc", _("OpenID Connect")),
      ("saml2", _("Security Assertion Markup Language"))
  )
  AVAILABLE_REGIONS = (
          (OPENSTACK_KEYSTONE_URL, 'Region1'),
          (OPENSTACK_KEYSTONE_URL, 'Region1'),
  )

• On the login screen, use the auth method dropdown to switch to the OIDC auth method.

Expected behavior:

• the region selection dropdown should remain visible

Known workaround:

• that problem can be worked around by selecting the region while the login method is set to "credentials", and then switching the method to "oidc" – the pull-down is hidden, but it still retains the value that was selected
• another way to work around it is to login to the default region and switch regions after that using the region switching drop-down at the top of the screen

Additional context:

• this we need to fix by modifying the code at https://github.com/openstack/horizon/blob/master/horizon/static/auth/login/login-finder.directive.js#L65-L78