We should not always add snap points at scrollmin and scrollmax, as we don now.
https://github.com/w3c/csswg-drafts/issues/4037
<rdar://problem/69443288>
Created attachment 411970 [details] Patch
Created attachment 412006 [details] Patch
Committed r268856: <https://trac.webkit.org/changeset/268856> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412006 [details].