The solution to this bug should be made in gnome-session package source I guess, which builds the gnome-session-fallback package.
If it sports the compiz-dependent session, it should depend on compiz, and on compiz-plugins which is currently missing but needed to provide 'switcher' or 'static switcher'. Also switcher must be enabled by default in some way (gconf config files I guess).
The solution to this bug should be made in gnome-session package source I guess, which builds the gnome-session- fallback package.
If it sports the compiz-dependent session, it should depend on compiz, and on compiz-plugins which is currently missing but needed to provide 'switcher' or 'static switcher'. Also switcher must be enabled by default in some way (gconf config files I guess).