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Restore multiple RenderWindowInteractor functionality.

Paul Choisel requested to merge paul.choisel/vtk:restore_multiple_renderWindowInteractor_functionality into master

Since VTK9, on Linux, vtkXRenderWindowInteractor is not capable of handling having multiple RenderWindowInteractor, while this functionality was supported in VTK8.2 and is still working on Windows (VTK9). This commit restores the ability to manage several instances by storing a pointer to each declared RenderWindowInteractor in a static vector, and dispatching the events to the right Interactor.

Fix: #17950 (closed)

Edited by Mathieu Westphal (Kitware)

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