I want to refine the output of ConformingDelaunayTriangulationBuilder, but
to do it correctly, I need to know which edges are derived from the input
constraint segments. What's the best way to do that?
The best I've come up with is to create a Set of input LineSegments, and
convert each QuadEdge to a LineSegment, and look for matches. But that
won't handle input segments that have been split with Steiner points.
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