When the kinetic scrolling reduces it's speed, there can be multiple frames where the movement is zero pixels (followed by a 1 pixel movement later on). This causes a "jitter" right at the end of the scroll which makes it feel less quality than other platforms. Instead, we should just clamp it as soon as we get a zero movement. This is what I put in Gtk+ to avoid the same issue. https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-22&id=4f63d839550f7a9038b391e7d3e1e6fc8bdfafa6
Created attachment 317927 [details] Patch Thank you Christian!
Committed r220638: <http://trac.webkit.org/changeset/220638>