Feature Request: FitVisible() function would be useful

[philpil]

This is a request for the timeline.

I have a very big nested timeline and i really like the zoom to fit button but i want to be able to zoom to fit what is visible where as the fit function sems to get all the itemsData

If I'm not wrong, I dont think there is a way to do something like timeline.getVisibleItems().fit() or timeline.fit(timeline.getVisibleItems());