Bug#241219: gdm: SessionDir is not used anymore

[Encolpe DEGOUTE]

Package: gdm
Version: 2.4.4.7-1
Severity: important
Tags: sid

All the files in /etc/gdm/Sessions are not used anymore to extend
default gnomee sessions and SessionDir option is not anymore understand
in the gdm.conf file.
Is it a new functionnality ?
Is there a new method to add other window|environment manager to the
default list ?

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (900, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.4-1-k7
Locale: LANG=fr_FR@euro, LC_CTYPE=fr_FR@euro