This test applies a content inset and then dumps the layer tree including visible rects. The visible rects should match the expected rects.
(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 800.00 500.00)
  (visible rect 0.00, 0.00 800.00 x 500.00)
  (coverage rect 0.00, 0.00 800.00 x 500.00)
  (intersects coverage rect 1)
  (contentsScale 1.00)
  (children 1
    (GraphicsLayer
      (bounds 800.00 500.00)
      (contentsOpaque 1)
      (visible rect 0.00, 0.00 800.00 x 500.00)
      (coverage rect 0.00, 0.00 800.00 x 500.00)
      (intersects coverage rect 1)
      (contentsScale 1.00)
      (tile cache coverage 0, 0 800 x 500)
      (tile size 800 x 512)
      (top left tile 0, 0 tiles grid 1 x 1)
      (in window 1)
    )
  )
)