fix TestGLUTRenderWindow.
there were issues with the test
-
handleResize
would get called beforedisplay
that resulted in the window size set in handleResize being lost and the window being recreated in display. - since the test didn't setup
glViewport
, we needed to make sure vtkExternalOpenGLRenderWindow didn't attempt to resize itself using the viewport by turning off AutomaticWindowPositionAndResize.