[LGM2009] dragging a clip should move all selected clips
@jeff
Submitted by Jeff F.T. Assigned to Brandon Lewis @brandon_lewis
Description
To reproduce:
- put multiple clips one after another in the timeline
- select them by doing a rectangle selection over them
- try dragging one of them
Result: only one clip is dragged
Expected result: move all selected clips at once
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=572098