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Avoid circular calls to `vtkRenderWindow::Render`.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:fix_circular_calls into master

vtkRenderWindow::Render calls vtkRenderWindowInteractor::Initialize, which calls the vtkRenderWindow::Render again! That's a bug. It doesn't make sense for interactor to call Render(). We don't encounter this code (except in rare cases e.g. using EGL) since the vtkRenderWindowInteractor subclasses don't call the superclass implementation for Initialize.

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