Description: With xscreensaver running, xdg-screensaver sets DE="gnome-screensaver" and, consequently, fails to talk to xscreensaver, trying to talk to gnome-screensaver instead. This leads to a number of problems, including xscreensaver kicking while watching a movie in xine because "xdg-screensaver suspend <win>" does not deactivate xscreensaver.

The problem seems to be that the xdg-screensaver script relies on gnome-screensaver-command returning a non-zero exit code if gnome-screensaver isn't running. This is the strategy it also uses for xscreensaver, and there it works: xscreensaver-command -version returns 255 if xscreensaver isn't running. gnome-screensaver-command, on the other hand, returns 0 no matter what, overriding the previously detected xscreensaver.

Additional info:
* package version(s)
xdg-utils 1.1.0rc1-2
gnome-screensaver 3.0.0-1

Steps to reproduce:

1. Fire up xscreensaver as the screensaver
2. Try "xdg-screensaver activate". This should start the screensaver, but nothing happens.