P: Pen Tilt doesn't work correctly with View > Flip Horizontal

While you're at it, please consider fixing other long-standing issues with View>Flip Horizontal, like the way that brushes set to Pen Tilt don't function correctly when the view is flipped (they can't tell that the view is flipped and when used are angled as if the view isn't flipped, despite the fact that the brush cursor visually tilts correctly.)