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    ENH: Add a PassiveObserver flag to vtkCommand. Passive observers do not... · 90d2aea5
    Jeff Baumes authored
    ENH: Add a PassiveObserver flag to vtkCommand.  Passive observers do not change the system state, and always get events, even if another command has focus.  Change vtkObject to process passive observers first.
    ENH: Change vtkInteractorEventRecorder to have PassiveObserver commands.
    ENH: Change InteractorStyleTreeMapHover to use the vtkInteractorEventRecorder.
    90d2aea5