Link selecting of layer in layer manager with driving layer

[ameraner]

Problem
During user testing, it was noticed that the current setup and combination of Layer Manager and Driving Layer box is not very intuitive and user friendly.
It was observed that a novel user intuitively expects that after having clicked on a layer in the Layer Manager, the according time steps should appear also in the Timeline Manager. This does not happen per default, since the Layer Manager and the Driving Layer boxes are completely unlinked - a user needs to actively manipulate both to see the wished information. This quickly leads to confusion and wrong interpretation of the information in the GUI.

Proposal
To improve the intuitiveness of this, I would suggest to link the action of selecting a Layer in the Layer Manager with the automatic selection of the according item in the Driving Layer box.

To maintain the current flexibility of switching between driving layers, the other way around should not apply; although we could consider going further with this and get rid of the driving layer manager alltogether and command the timeline via the Layer Manager, for simplicty. I cannot think of a drawback of this at this time.