A programmatic scroll should stop any rubberbanding
Created attachment 413119 [details] Patch
<rdar://problem/71016512>
Created attachment 413120 [details] Patch
Created attachment 413132 [details] Patch
Committed r269373: <https://trac.webkit.org/changeset/269373> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413132 [details].