In my plugin I'm attempting to perform some actions using username and plain password of user, that just was logged in. For that purpose I've added new EVENT_AFTER_LOGIN event (could be useful in base code too) and call it at the end of "auth_attempt_login" function. In the actual hook to this new event I use "current_user_is_anonymous" function which returns incorrect result - it tells me, that I'm anonymous, but I'm not.

Inside "current_user_is_anonymous" there is code, that returns current authenticated username - current_user_get_field( 'username' ). At the end "auth_get_current_user_id" function is called and returns globally cached current user id (from $g_cache_current_user_id vaiable). Just after login is made (even before redirect to login_cookie_test.php) this variable is not reset and I still get previously logged/anonymous user id.

I propose to add this:
$g_cache_current_user_id = $t_user_id; // for currentuser* functions

at the end of "auth_attempt_login" function.