Original patch worked with WKLegacy, but not with WK2.
Created attachment 340873 [details] FIX
Comment on attachment 340873 [details] FIX Clearing flags on attachment: 340873 Committed r232039: <https://trac.webkit.org/changeset/232039>
All reviewed patches have been landed. Closing bug.
<rdar://problem/40436083>