Brought back old tools "Remove Gap(s)" and "Insert Gap".
It's actually one of the first tools I ever coded for it in 90ies, so useful!
* Remove Gap(s)
This checks if there's no strip at a given position, and slides all strips
together to the left, until the gap is closed.
- BackSpace key, remove gap at current frame (or first gap at right of frame)
- SHIFT+BackSpace, remove all gaps at or to right of current frame.
* Insert Gap
Shifts all strips to right of current frame with 10 frames. (Amount can be
set in Toolbar redo panel).
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