[VTKVolume] add option to expand the controller #1631
Merged
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implements #1630
by default I let it to true
Customizing the controller widget is doable but it should be more a vtk.js request since I use directly the VolumeController class defined in vtkjs and there are not options to customize it (https://kitware.github.io/vtk-js/api/Interaction_UI_VolumeController.html)