[Pkg-lxde-maintainers] Bug#587163: update-alternatives doesn't keep startlxde

[Farmbuyer]

FWIW, this remains broken.  A recent update changed my alternatives away
from startlxde to startxfce4 (even though they have the same priority and
it still thinks the "best version" is the previous setting).

$ update-alternatives --display x-session-manager
x-session-manager - auto mode
  link currently points to /usr/bin/startxfce4
/usr/bin/lxsession - priority 49
  slave x-session-manager.1.gz: /usr/share/man/man1/lxsession.1.gz
/usr/bin/openbox-session - priority 40
  slave x-session-manager.1.gz: /usr/share/man/man1/openbox-session.1.gz
/usr/bin/startlxde - priority 50
  slave x-session-manager.1.gz: /usr/share/man/man1/startlxde.1.gz
/usr/bin/startxfce4 - priority 50
  slave x-session-manager.1.gz: /usr/share/man/man1/startxfce4.1.gz
/usr/bin/xfce4-session - priority 40
  slave x-session-manager.1.gz: /usr/share/man/man1/xfce4-session.1.gz
Current 'best' version is '/usr/bin/startlxde'.

$ grep x-session-manager /var/log/alternatives.log
update-alternatives 2012-03-20 18:58:29: run with --remove
x-session-manager /usr/bin/startlxde
update-alternatives 2012-03-20 18:58:29: link group x-session-manager
updated to point to /usr/bin/startxfce4
update-alternatives 2012-03-20 19:00:18: run with --install
/usr/bin/x-session-manager x-session-manager /usr/bin/xfce4-session 40
--slave /usr/share/man/man1/x-session-manager.1.gz
x-session-manager.1.gz /usr/share/man/man1/xfce4-session.1.gz
update-alternatives 2012-03-20 19:00:18: run with --install
/usr/bin/x-session-manager x-session-manager /usr/bin/startxfce4 50
--slave /usr/share/man/man1/x-session-manager.1.gz
x-session-manager.1.gz /usr/share/man/man1/startxfce4.1.gz
update-alternatives 2012-03-20 19:03:28: run with --install
/usr/bin/x-session-manager x-session-manager /usr/bin/startlxde 50
--slave /usr/share/man/man1/x-session-manager.1.gz
x-session-manager.1.gz /usr/share/man/man1/startlxde.1.gz