When showing a new content view, the back/forward list splices out old entries that are no longer part of the linear history. Those old entries are not being dissociated in the case where the new content view being shown is already in the back forward list.
<rdar://problem/15092420>
Created attachment 212760 [details] Patch
Comment on attachment 212760 [details] Patch Clearing flags on attachment: 212760 Committed r156520: <http://trac.webkit.org/changeset/156520>
All reviewed patches have been landed. Closing bug.