Problem with session-user.htmlLen

[Barry Fishman <barry ecubist org>]

The entry for "Configure a user default session" talks about
editing the file "/usr/share/AccountServices/users/<username>" file.

However this gets rewritten each reboot, so the information
is not persistent.

This is very miss-leading.  There is no information about how
and why this is being gone.

I have an account which has a uid < 1000.  Each time the system
is rebooted the XSession field is erased, and a SystemAccount=true
is added.  Can the <1000 threshold be changed, and where is it being
determined.  It does not seem to be in the /etc/login.defs file
and there is nothing directly in the /etc/pam.d/gdm-login file.