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Prevent PVGeometryFilter to merge points of quadratic meshes.

Joachim Pouderoux requested to merge jpouderoux/paraview:10598_disable_quadratic_surface_point_merging into master

The filter internally call a vtkUnstructuredGridSurfaceFilter to handle subdivision of quadratic cells. By default this filter merge points in the generated mesh. This prevent to perform a correct visualization of non-continuous fields defined with duplicated points (eg. crack or fault).

This patch turn the merging feature off for such meshes. It also needs a VTK patch of vtkDataSetSurfaceFeature.

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