lightdm performs autologin over a previous locked session (via light locker)

[Laércio de Sousa]

After Bazaar revision 2006, lightdm supports "auto relogin", something similar to AutoLoginAgain in kdm.

In my tests, I've set lightdm to autologin as guest after a timeout of 30 seconds:

[SeatDefaults]
autologin-guest=true
autologin-user-timeout=30

However, if I log in as another user and lock its session (using light locker), lightdm performs an automatic login as guest on top of my locked session. I guess it's due to the fact that light locker uses lightdm greeter to lock screen, so when it's displayed, it triggers another autologin timeout.

This is specially bad for non-seat0 seats, when you have no user-switching mechanism available, and an autologin over a locked session can hang the seat completely.