QVTKOpenGLWidget event implementation is impacted by a Qt bug on OSX
QVTKOpenGLWidget new implementation 45704131 uses quite an intricate design in order to transfer events back and forth between the widget and it's associated window.
This implementation is due to a bug on OSX.
Once this bug have been fixed, a simpler implementation using Qt::WindowTransparentForInputFlag in the window could be used, reducing potential maintenance cost.
Edited by Mathieu Westphal (Kitware)