Add a test and a fix.
Created attachment 380425 [details] patch
Created attachment 380428 [details] patch
Created attachment 380431 [details] patch
Created attachment 380436 [details] patch
Comment on attachment 380436 [details] patch Clearing flags on attachment: 380436 Committed r250861: <https://trac.webkit.org/changeset/250861>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56089548>