[vtkusers] Using MacBook trackpad freezes application

[Enzo Matsumiya]

Hi,

I'm experiencing exactly this bug, though not only when scrolling, dragging
also freezes:

http://www.paraview.org/Bug/view.php?id=15822

- macOS 10.11 or 10.12
- QVTKWidget, vktResliceImageViewer with a DICOM data set
- Either VTK 7.0 or 7.1

I normally use the MacBook connected to an external monitor, keyboard and
mouse (non-Apple). I just recently stumbled on this issue when I needed to
work with it on my lap.

When using an external mouse, everything works fine.
When using the trackpad, it *looks* like it worked (windowing is changed,
reslice occurs, etc), but it stats getting so slow that the application
freezes. The external trackpad has the same behaviour (not sure this is
obvious). If it's not very clear, please download the videos attached to
the bug report mentioned.


I hope there is some solution for this.


Thank you very much!

-- 

Enzo Ferlin Matsumiya
enzo.matsumiya AT gmail DOT com
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