Formatting contexts should always expand to enclose floats

LayoutTests/platform/linux/fast/repaint/float-overflow-right-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [727, 101, 16, 16],
         [727, 99, 16, 19],
@@ skipping 122 matching lines @@
         [681, 366, 61, 28],
         [681, 360, 61, 28],
         [681, 327, 61, 28],
         [681, 321, 61, 28],
         [681, 288, 58, 28],
         [681, 282, 58, 28],
         [677, 537, 64, 37],
         [677, 531, 64, 37],
         [677, 498, 64, 25],
         [677, 492, 64, 25],
-        [677, 459, 62, 22],
-        [677, 453, 62, 22],
+        [677, 459, 64, 25],
+        [677, 453, 64, 25],
         [677, 420, 62, 22],
         [677, 414, 62, 22],
         [677, 249, 64, 25],
         [677, 243, 64, 25],
         [677, 210, 64, 25],
         [677, 204, 64, 25],
         [677, 171, 64, 25],
         [677, 165, 64, 25],
         [677, 132, 64, 25],
         [677, 126, 64, 25],
         [677, 93, 66, 25],
         [677, 87, 66, 25],
         [677, 54, 66, 25],
         [677, 48, 66, 25],
         [677, 15, 62, 25],
         [677, 9, 62, 25],
         [11, 366, 778, 28],
         [11, 360, 778, 28]
       ]
     }
   ]
 }