inner edge display for quadric element is not correct for version 9.1

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Dear Cory Quammen and Mathieu Westphal,

thanks for your reply. Below is the sample code i used to test and generate above images.

void testReadPolydata(int argc, char* argv[])
{
    vtkNew<vtkXMLPolyDataReader> reader;
    reader->SetFileName(argv[1]);
    reader->Update();

    auto poly = reader->GetOutput();

    vtkNew<vtkOpenGLPolyDataMapper> mapper;
    mapper->SetInputData(poly);

    vtkNew<vtkActor> actor;
    actor->SetMapper(mapper);
    actor->GetProperty()->SetEdgeVisibility(1);

    vtkNew<vtkRenderer> render;
    render->AddViewProp(actor);

    vtkNew<vtkRenderWindow> window;
    window->AddRenderer(render);

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
    renderWindowInteractor->SetRenderWindow(window);

    renderWindowInteractor->Initialize();


    window->Render();
    renderWindowInteractor->Start();

}

thanks for your kindly help!