Antialiasing issue in fullscreen QVtkOpenGLWidget

I have such problem - when I make the vtkOpenGlWidget as separate window and call showFullscreen() on it, the antialiasing is set disabled and there is no way to turn it on. The mesh looks ugly, especially if the EdgeVisibillity is turned on - lines are not antialiased at all.

Normal look: Ugly look (in fullscreen mode):

It becomes uglier when I go back from fullscreen mode to normal mode

I have tried to set number of multisamples anywhere where I found, but nothing happens.

VTK 8.1 (latest master), PCL 1.8.1, Visual Studio 2015, Windows 10, NVidia 950M