add additional power management settings if docked vs just plugged into external power or on battery
Although we have https://gitlab.xfce.org/xfce/xfce4-power-manager/-/issues/202 , xfce4-power-manager tries to inhibit logind and mimic `HandleLidSwitch` and `HandleLidSwitchExternalPower` that is configurable in `logind.conf`. `logind.conf` also has an option for `HandleLidSwitchDocked` which "If the system is inserted in a docking station, or if more than one display is connected, the action specified by HandleLidSwitchDocked= occurs."
I'd like to have this same option in xfce. If you plug your laptop into a docking station and close the lid, there are many times where you don't want it to go to sleep. However, normally if you plug your laptop into just a charger, you do want it to go to sleep when you close the lid.
issue