[LightDM] Multiple sessions on a single seat

[Diego Alvarez]

Hello folks,

I'm having some trouble with a LightDM configuration I want to set-up, so
maybe someone here knows how to do this.
What I want to do is, when booting, have multiple sessions running at on
different VTs on a single seat. I mean, only one monitor/keyboard but have
one user logged in on VT7 and another user on VT8 using another DE and such.
This was possible on older versions of LightDM, before integrating logind's
seat detection. I just used the [Seat:x] configuration in
/etc/lightdm/lightdm.conf and it did exactly what I wanted.
Problem is that now LightDM uses logind to handle detecting the seats, but
it seems to ignore the fact one may want to run multiple sessions with one
seat only. Configuration for the first session works fine, but I can no
longer tell LightDM to start other X sessions on another VT.
I can use 'dm-tool' to start another session, but I cannot make it so
LightDM does that automatically on startup nor configure the new session
(i.e. autologin, which greeter to use, etc).
Does anyone know how I can make this set up work?
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