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Inform the camera of the IceT subsampling projection matrix.

Allison Vacanti requested to merge allisonvacanti/paraview:icet-interactor-fix into master

Some classes (e.g. widgets) use vtkRenderer/vtkCoordinate to convert display <--> world coordinates. However, on OpenGL2, only the actual shader matrices were modified, and the camera state was not touched, leading to rendering artifacts when interactive subsampling was enabled in ParaView.

This uses the new ExplicitProjectionMatrix in vtkCamera to allow the VTK coordinate converters to use the same transformation pipeline as the shaders.

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