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Opengl release resources

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:opengl-release-resources into master

vtkOpenGLQuadHelper: release OpenGL resources.

vtkOpenGLQuadHelper now releases resources correctly if the context goes away before the vtkOpenGLQuadHelper instance does.

Address errors on closing window in ParaView (paraview/paraview#18938 (closed)). The issues was that the OpenGL context was destoyed when the QT window went away. vtkOpenGLQuadHelper instance held by vtkOpenGLFXAAFilter was not cleaned up until after the context was destroyed causing errors.

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