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- Fixed bug with resetting marker's flag for non-transforming
tracks when canceling transformation.
- Fixed bug with keyframing non-selected tracks when initializing
tracking tools.
- Changed selection policy: now invisible parts of marker
can be selected.
- Added operator redo panel to Clip Editor.
- Set Scale operator now uses operator property for scale.
- Added operator "Clean Tracks" which currently checks if tracks
are tracked long enough and can select bad tracks, delete them
or delete tracking segments which are too short.
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