Bug#643634: restore nested login in gdm3

[dave bl]

Ok I got it to work :) . It was fairly trivial to make it compile TM.
The one final issue (that I encountered) was that the configuration
stuffwasn't setting up the xephyr command :) (I have hard-coded it in
this diff, which I know is not ok - also needing removal is the extra
/ useless debug messages  that are currently in the code).
-------------- next part --------------
A non-text attachment was scrubbed...
Name: diff_against_gdm_3.0.4.diff
Type: text/x-diff
Size: 85257 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/pkg-gnome-maintainers/attachments/20110930/79e931b3/attachment-0001.diff>