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Add stable clip to vtkQuadraticTetra

Julien Fausty requested to merge julien.fausty/vtk:add_stable_clip_nonlinear_cells into master

This MR introduces a new vtkNonLinearCell::StableClip method and an implementation for vtkQuadraticTetra::StableClip. The goal of this special clip is to only decompose the cell if it is actually clipped. Otherwise, keep the non-linear cell in its entirety.

This method is now used in vtkClipDataSet for non-linear cells.

This is a continuation of: !10010 (closed)

WARNING: this approach to clipping non-linear cells will lead to topological holes between decomposed cells and the remaining non-linear cells

Edited by Julien Fausty

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