only visual. iterators need to adapt.
Created attachment 413179 [details] Patch
Created attachment 413282 [details] Patch
Created attachment 413290 [details] Patch
Committed r269431: <https://trac.webkit.org/changeset/269431> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413290 [details].
<rdar://problem/71077630>