Commit
c3cab28 removed bits setting the password char that was used to
allow typing the password after a failure but before the first question
for the new attempt came.
Without that code, in complex PAM setups you can end up with a visible
password.
https://bugzilla.gnome.org/show_bug.cgi?id=687113
this._firstQuestion = true;
this._promptEntry.text = '';
+ this._promptEntry.clutter_text.set_password_char('\u25cf');
+ this._promptEntry.menu.isPassword = true;
this._updateSensitivity(false);
this._setWorking(false);