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Utkarsh Ayachit authored
When on interacted with any of the chart views, it messed up the undo/redo stack adding individual undo actions for each mouse move. Fixed that by ensuring that the entire interaction gets clubbed in a single undo event. Needed to add new vtkPVContextInteractorStyle class since vtkContextInteractorStyle does not fire start/end interaction events which are needed to build undo stack properly.
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