xcfe4-session still recommends xscreensaver despite that fact that for years xscreensaver has prevented (even
with DPMS settings turned off) prevented xfce's power manager from shutting of the display or going into
sleep mode due to taking over the xidle timer.

xscreensaver's maintainer, in a bug about this, has expressed his opinion that it's not a bug and he has
no intention of fixing it.  Therefore xscreensaver is broken for xfce and should be replace, perhaps
by light-locker now that it is avialable.