Forward InteractionEvent to Interactor.
vtkInteractorStyle already forwards StartInteraction and EndInteraction events via the vtkRenderWindowInteractor set on it. It only makes sense to forward the InteractionEvent as well. Applications needing StartInteraction and EndInteraction events are quite likely to need the InteractionEvent as well. Current approach is to list to that event directly on the vtkInteractorStyle instance -- which is a little weird since the StartInteraction/EndInteraction events can be directly observed on the vtkRenderWindowInteractor. Change-Id: I61d6ee39b53f2b990d2a1aad5df7bcf18d3800e1
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