@lassoan
Yes we faced various problems with QVTKOpenGLWidget when we needed to enable MSAA along with the new dual depth peeling, and the compatibility with HiDPI displays was also quite complex to achieve.
Anyway, we will have to switch to a QVTKOpenGLNativeWidget in order to solve that particular problem (we don’t need stereo rendering either 
)
+1 for choosing a new name
QVTKOpenGLWidget and QVTKOpenGLWidgetWarningOnlyForStereoRendering seems like a good one 