With this shortcut method, tree traversal code will be able to have more consistent pattern.
Created attachment 142956 [details] Patch
Dimitri, could you take a look? This patch is aiming to make shadow-nonshadow traversal looks more seamless than special case if possible.
Comment on attachment 142956 [details] Patch This is very pretty.
Comment on attachment 142956 [details] Patch Clearing flags on attachment: 142956 Committed r117796: <http://trac.webkit.org/changeset/117796>
All reviewed patches have been landed. Closing bug.