Clip a closed polyline to segment it

[brunnerant]

Hello,

First, thanks a lot for this insane library, it is the best one by a far amount !!

I encountered something that I didn't manage to solve. I would like to clip a closed polyline - that is, its starting and ending vertices coincide - with some polygons, in order to segment it. It works just, fine, but the only problem, is that the segment where the starting and ending vertices lie is split in two segments after the clipping operation, which is not what I want. Here is the (pseudo) code for what I want to do:

ClipperD clipper;
PathD subject = myPolyline;
subject.push_back(subject.front()); // This joins the start and end of the polyline
clipper.AddOpenSubject({ subject });
clipper.AddClip(myPolygons);
PathsD open, closed;
clipper.Execute(ClipType::Difference, FillRule::NonZero, closed, open);

// Do something with the resulting open segments
// Problem: the segment containing the starting point of the polyline is split in two segments

Is there a procedure to simplify open paths that coincide on their ending vertices ? Or is there another way to work around this issue ?

Thanks for your help !