This test passes if moving the cursor from one of the blue items to the other produces no repaint errors (such as cropping of one of the blue items).

(repaint rects
  (rect 49 82 350 215)
  (rect 49 82 350 215)
  (rect 49 82 350 215)
  (rect 49 82 350 17)
  (rect 49 82 350 215)
  (rect 49 82 350 215)
  (rect 49 82 350 215)
  (rect 400 82 350 215)
  (rect 400 82 350 215)
  (rect 400 82 350 215)
  (rect 49 82 350 17)
  (rect 400 82 350 17)
)