De-selecting a layer?

Hi everbody! Yeah, this is a long-standing issue (#1498) :cry: we should fix really soon. I think that a possible solution would be to have two modes in the timeline, like two little buttons:

  1. an arrow to just select what is clicked (new default mode), and
  2. a marquee tool (which should act like the current mode)

Mockup:

image

Related threads: