[vtkusers] error with find point

[Jana Sefcikova]

Hi Gonzalo, I would say that there is not one-to-one mapping between
original polydata and polydata resulted from vtkFeatureEdges. Fast looking
to code vtkFeatureEdges.cxx, I found for example

 vtkTriangleStrip::DecomposeStrip(npts, pts, newPolys);

This can result in different mesh (convert polydata to triangles before
running filter). I did not go further inside that code ...

j.
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