Dirty nearby lineboxes if we layout a float rather than trying to work it out later

LayoutTests/platform/linux/fast/repaint/line-flow-with-floats-5-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [303, 420, 66, 19],
         [275, 420, 64, 19],
         [134, 360, 132, 19],
         [118, 360, 132, 19],
         [65, 380, 304, 59],
         [65, 380, 287, 19],
         [49, 380, 320, 59],
         [49, 380, 303, 19],
         [46, 363, 16, 64],
         [14, 440, 354, 59],
         [14, 420, 355, 79],
-        [8, 360, 418, 99]
+        [8, 320, 418, 279]
       ]
     }
   ]
 }