Importing and inserting an invalid file to the timeline directly from Nautilus breaks future clip insertions
@jeff
Submitted by Jeff F.T. Assigned to Alex Băluț @aleb
Description
Drag a video clip from Nautilus, then drag a pdf file (or whatever invalid file), and you won't be able to drag anything to the timeline afterwards.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=752129