We currently use Mantis SimpleSAMLphpAuth plugin for authenticating our users from a SimpleSAMLphp idp (SSP). However, users are required to enter their username twice - first on the mantis username page and then username and password on the SSP login page. This is an usability glitch if the user is not already logged into SSP.

It would be nice to have a hook/config in AuthPlugin class which tells Mantis to directly initiate SSP login instead of determining the login method based on the username.

I understand that this would work only where mantis has only one authentication backend. However, I think, majority of Mantis instances use only one authentication backend and this might not seriously affect existing instances.