To align with what other ports are doing, our fixed position elements should be fixed position on the x axis as well as y.
Created attachment 179987 [details] Patch
Comment on attachment 179987 [details] Patch Looks good.
Comment on attachment 179987 [details] Patch Clearing flags on attachment: 179987 Committed r138055: <http://trac.webkit.org/changeset/138055>
All reviewed patches have been landed. Closing bug.