When scrolling diagonally in a container with snap points, the rubber banding animation loop bails early to avoid conflicting with the scroll snapping animation loop. This should be fixed so that the snapping and rubber banding animations can occur simultaneously (perhaps on a unified timer).
Created attachment 256310 [details] Scroll diagonally against any one of the edges of the overflow container
Fixed by <http://trac.webkit.org/changeset/209070>