[vtkusers] Problems with vtkRenderWindowInteractor on macOS using Cocoa

[Noè Murr]

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Hi all,

I'm learning VTK reading the book VTKTextBook.
I've tried to execute the Cone example at link:
https://lorensen.github.io/VTKExamples/site/Cxx/GeometricObjects/Cone/

When I run it I've got a strange behavior that is difficult to explain
with words, but you can see it in the gif at the following link:
https://imgur.com/lJigYGu

The code that I have used is a little different from the code of the
example but both of them give the same problem.

you can see the code of my .cpp file here:
https://pastebin.com/36pkAGhA

and my CMakeLists.txt here:
https://pastebin.com/cBHEYJXS

Where is the problem?
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