[vtkusers] VTK widget "border" width

[abstracted]

Some quick background:
I have been developing a program that integrates VTK into a GUI designed
with Qt. Thus I have been using the QVTKRenderWindowInteractor for Qt
integration. Below is a code snippet that shows how I initialize all of the
VTK business.

class modelView(QMainWindow):
    ...
    
    def setupUi(self):

        ...

        self.frame = QFrame()
        self.frame.setLineWidth(0)
        self.frame.setFrameStyle(QFrame.NoFrame)
    
        self.vl = QVBoxLayout()
        self.vtkWidget = QVTKRenderWindowInteractor(self.frame)
        self.vl.addWidget(self.vtkWidget)
    
        self.ren = vtkRenderer()
        self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
        self.iren = self.vtkWidget.GetRenderWindow().GetInteractor()
    
        self.ren.ResetCamera()
    
        self.frame.setLayout(self.vl)
        self.setCentralWidget(self.frame)
    
        self.show()
        self.iren.Initialize()
        self.iren.Start()
    
    ...

Now for my actual question, it appears as though the render window has a
border around it. I.e. the outline is offset by some amount. The image below
shows what I am attempting to say. The top cropped image comes from a
different program written in Qt, the two left widgets are dockwidgets and
the right is a QGraphicsView (I think). The bottom image is cropped from my
program, the same setup but thee right widget is a VTK render window. You
can see the difference in "border width", if that's a thing.

My curiosity got the best of me, and I am now curious as to how this happens
and if you change it (it looks odd to me).

<http://vtk.1045678.n5.nabble.com/file/n5729287/example.png> 




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