allow importing by dragging and dropping into the timeline
@jeff
Submitted by Jeff F.T. Assigned to Alex Băluț @aleb
Description
Importing by dragging into the media library is neat, however I would like to be able to import by drag&drop into the timeline directly, too.
By doing so, 2 steps are combined into 1: importing, and placing the clip on the timeline.
This also depends on bug #T2019
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=570118