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Install resize callback for SDL2 interactor in AddEventHandler

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:resize-callback-for-add-event-handler into master

When C++ application does not use a main function, but instead runs the interactor event loop in a general C++ static/member function, it is recommended to call iren->AddEventHandler instead of iren->Start. When used this way, window resizes did not work because the resize callback was not installed.

Edited by Jaswant Panchumarti (Kitware)

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