Tests invalidation on justify-items style change (legacy value). Passes if green bars are centerd inside their red container.

(repaint rects
  (rect 1 53 50 50)
  (rect 0 52 52 100)
  (rect 151 53 50 50)
  (rect 150 52 52 100)
  (rect 0 52 202 300)
  (rect 0 52 251 300)
  (rect 0 52 300 400)
)