[RhinoCommon] BrepFace.TrimAwareIsoCurve does not work on domain boundaries

@menno wrote:

No matter what I do, when extracting trim-aware isocurves on the face edge, the result is null.

BrepFace bf; // defined elsewhere
Interval iv = bf.Domain(0);
int dir = 1;
Curve[] crv = bf.TrimAwareIsoCurve(dir, iv.T0); // null
crv = bf.TrimAwareIsoCurve((dir+1)%2, iv.T0); // also null, I never know what is what with dir and value

I guess, I need to find out which of the edges correspond to the desired iso-curves and go with that, but that is error prone.

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