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vtkWarpScalar: fix double apply generate enclosure bug

Julien Fausty requested to merge julien.fausty/vtk:warp-scalar-enclosure-fix into master

fixes paraview/paraview:#21655

The problem was mainly in the shallow copying of the topology of the input into the output and the subsequent appending to that topology. This fix works by deep copying when the Generateenclosure property is set.

This MR also introduces:

  • a subsequent fix in the associated test
  • some refactoring and additional type checking
  • a minor algorithm fix (max->min so as to only iterate over the correct number of edges of a polygon)
Edited by Julien Fausty

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