ShallowCopy implementations lacking on many vtkWidgetRepresentation classes
A search on the implementation of the ShallowCopy method for vtkWidgetRepresentation subclasses revealed that only the following have one:
- vtkConstrainedPointHandleRepresentation
- vtkHandleRepresentation
- vtkProp3DButtonRepresentation
- vtkSphereHandleRepresentation
- vtkTexturedButtonRepresentation
- vtkWidgetRepresentation
- vtkAffineRepresentation
- vtkButtonRepresentation