Integration issue: xfce4-screensaver doesn't stop the currently running screensaver when xfce4-power-manager puts the screen into blank/sleep/off mode

As the title says: and it's a waste of energy (if one uses some xscreensaver, a lot of energy, for some of them) and cpu cycles.

Since it's an integration issue, i've opened an issue on xfce4-power-manager too.