Thank you Stephane. Yes, I would like either to move the selected points or simply to delete them.

The polyline2D are actually used in our CapillaryTrack plugin, to delineate the limits of territories in kymographs. Sometimes, our detection algorithm is not very efficient or there is a glitch in the video (or stack of images) and we need to correct the limit locally. In my current implementation, there is one ROI point per pixel of the image detected, which makes it quite cumbersome to edit.

At one point, I looked at your code to find how to do it, but after a day, I thought it was not really possible.

Anyway, it would be a nice feature to add to Icy – I guess I am not the only one with this type of problem.

Fred