VDG suggestions and wishes about the system tray

[Kai Uwe Broulik]

> yeah, the function to check from the scripting engine is there and ported, but 
> the systray doesn't use it and just adds it by default, i guess because there 
> are brightness controls as well now

And the PM checkbox which is handy on desktop too. And it shows your mouse battery, if any. So battery should he added all the time, passive if no batteries. (Which is what it does atm)