trimmed clips can be extended under/over clips next to them
@j
Submitted by j^ Assigned to Alessandro Decina @alessandro.d
Description
if you add a trimmed clip to the timeline and add another one right behind it, you can extend the trimmed clip under the second one.
right now clips dont overlap so this should not happen.
Imported from https://bugzilla.gnome.org/show_bug.cgi?id=589694