Bug#733059: gnome-screensaver cannot be launched by alternative gnome-session

[Mike Crowe]

I'm not absolutely sure that this is what the original reporter meant but
I've just run into this problem when using gnome-session to launch my own
"i3-gnome" session. My session file contains:

 [GNOME Session]
 Name=i3 Gnome session
 RequiredComponents=gnome-settings-daemon;gnome-screensaver;nm-applet;i3-gnome

gnome-settings-daemon, nm-applet and (my) i3-gnome are launched correctly
yet gnome-screensaver is not. This appears to be due to the following line
in /usr/share/gnome/autostart/gnome-screensaver.desktop:

 AutostartCondition=GNOME3 if-session gnome-flashback

(I assume that modern gnome-shell launches gnome-screensaver itself now.)

If I comment the line out then gnome-screensaver is launched correctly.

Perhaps there is a way to invert this condition so that gnome-screensaver
is enabled except on GNOME3?

Thanks.

Mike.