johnisfaster

Is it possible to tell a m4l device whether the rack its nested in is selected by the blue hand or not?

is-this-devices-rack-currently-selected

Not sure about blue hand, but if you just want the currently selected rack, you would just detect any selected device, then determine whether it is a rack (has chains), then determine whether the rack is a parent of the current device (you could keep getting the parent of the device, until you hit "track"). A bit tricky, but not impossible.

Is this devices rack currently selected?