dcbdae85eb
For the "Not Listed?" case we will need to be able to identify when the user has entered their username. Once we have a way of tracking when the username is entered, we can then defer showing the session list too early, before the user can reliably pick a session. This username tracking will also be important for implementing a disable-user-list configuration key. If the config key gets toggled off at runtime, we'll need to know if we're at a disruptive part of the authentication process or not, so we know whether we can can expose the user list right away, or wait until the authentication conversation finishes. Right now, we pass null in for an initial username, and let the PAM machinery ask the user, which means we have no good way of knowing when the username is entered. This commit changes the "Not Listed?" code to ask the user their username up front, before starting the PAM conversation in much the same way we do if the user picks a user from the user list. https://bugzilla.gnome.org/show_bug.cgi?id=660660
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