Comment 14 for bug 1292324

I am interested in this feature, just not working on it :)

From what I understand reading the comments here the correct place to do this is inside session-child.c - i.e. run the X server process after dropping privileges but before the session is run. A new XServerInSession class will probably have to be made so LightDM is happy though the work will be done inside session-child.c. This will probably be a bit odd in the LightDM architecture, so some refactoring is probably suggested to make these changes fit in a bit better (though that can be done later).