When we update the region range of a box we always relayout if the range has changed. This can be optimized in simple cases, when the box doesn't contain any trailing floats (that don't affect the height of the block).
Created attachment 231446 [details] Patch
r=me
Comment on attachment 231446 [details] Patch Clearing flags on attachment: 231446 Committed r168836: <http://trac.webkit.org/changeset/168836>
All reviewed patches have been landed. Closing bug.