> - support for Google's login_hint (set
'UseLoginHint' to TRUE)
I don't remember what that was about - can you remind me when setting
that to true will be useful?
If you know the username you are trying to authenticate, then, if that username is stored
in an identity, or provided to gsso when initiating an authentication session, and
UseLoginHint is set to TRUE, then Google will pre-fill the email box on the sign-in form
or select the proper multi-login browser session, so the app authorization flow is simpler
for the user.
It's a non-standard google extension, so not enabled by default.