Merge topic 'python-qwindow-scale' into release

b76eee55 For Python Qt widget, set DPI for text scaling

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6847

Wrapping/Python/vtkmodules/qt/QVTKRenderWindowInteractor.py

@@ -384,6 +384,7 @@ class QVTKRenderWindowInteractor(QVTKRWIBaseClass):
         scale = self._getPixelRatio()
         w = int(round(scale*self.width()))
         h = int(round(scale*self.height()))
+        self._RenderWindow.SetDPI(int(round(72*scale)))
         vtkRenderWindow.SetSize(self._RenderWindow, w, h)
         self._Iren.SetSize(w, h)
         self._Iren.ConfigureEvent()