We should just use StylePropertySet::copy() instead of cloning everything manually in ElementAttributeData::cloneDataFrom().
Created attachment 160733 [details] Patch
CC'ing Antti who is a pretty cool guy.
Comment on attachment 160733 [details] Patch Looks reasonable.
Comment on attachment 160733 [details] Patch Clearing flags on attachment: 160733 Committed r126872: <http://trac.webkit.org/changeset/126872>
All reviewed patches have been landed. Closing bug.