Stale segmentation when importing geff

[AnniekStok]

Hopefully this gets fixed already with #447 but putting this here just in case:

after importing a geff, the segmentation goes stale because of the MotileRun wrapping in TracksList.add_tracks. When you paint, the newly painted area is immediately removed, although the change is registered on the graph (the centroid moves, but the segmentation is stale).

I am seeing this on Motile-Tracker main (9aed13f) and Funtracks main (be685dbe36956964e34cb3c02c408d20c523dbbb).

[AnniekStok]

I am still having this issue when I import a geff, even though #447 was merged. Will investigate.