Zooming back near the bottom or top of the document can lead to over-scrolling because the restored position is not bound by document size at the correct zooming level.
Created attachment 138793 [details]
Comment on attachment 138793 [details]
Clearing flags on attachment: 138793
Committed r115193: <http://trac.webkit.org/changeset/115193>
All reviewed patches have been landed. Closing bug.