[vtkusers] Crash in vtkShaderProgram/vtkOpenGLPolyDataMapper

[dei]

This feels like a race condition between the vtk initialization of OpenGL and
the first vtkRender() call. Is there a way to test for OpenGL initialized? I
could block vtkRender() calls till it's ready to go. vtk's usage of OpenGL
changed a lot in the last 2 years, right?



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