when I am in 2up split view, in a navigation controller stack pushed to a second back button, it would be nice to be able to have the left vertical bar also have an offset to the back button that's the same height as the camera/status occlusion is. But I can't add a fixed bar button of width (whatever the occlusion frame height is) (The desire is to have symmetric vertical bars if the user is in the same view controller. Otherwise it just looks weird.)