If user has existing session with a client then attach the session to that user upon re-authentication with same client without displaying the login page OR In standard realm, provided that user has an existing session with a client and if the same user when authenticates with different client and a different IDP through KC_IDP_HINT, the previous session should be removed and allowed to login.
If user has existing session with a client then attach the session to that user upon re-authentication with same client without displaying the login page OR In standard realm, provided that user has an existing session with a client and if the same user when authenticates with different client and a different IDP through KC_IDP_HINT, the previous session should be removed and allowed to login.