With async overflow scrolling, programmatic scroll to a negative offset fails to clamp the scroll offset
Created attachment 370551 [details] Patch
<rdar://problem/49720087>
Comment on attachment 370551 [details] Patch Clearing flags on attachment: 370551 Committed r245742: <https://trac.webkit.org/changeset/245742>
All reviewed patches have been landed. Closing bug.