When disabled, it also disables selection of text with dragging, and this comes as a surprise for many people.
Created attachment 328127 [details] Patch
Comment on attachment 328127 [details] Patch Clearing flags on attachment: 328127 Committed r225421: <https://trac.webkit.org/changeset/225421>
All reviewed patches have been landed. Closing bug.
<rdar://problem/35807178>