[Webkit-unassigned] [Bug 192344] [css-scroll-snap] internal "scroll chaining" boundary at ancestor scroll-snap point prevents movement to next snap position even causes flickering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192344

--- Comment #4 from jonjohnjohnson <hi at jonjohnjohnson.com> ---
Another way to see the strangeness between scroll chaining and scroll-snap is shown in this simple video of the more reduced test case that is attached.

http://cl.ly/8044130b495b

Here on initial load of the case, the first downward scroll gesture from a trackpad at a strength that scrolls the internal scroller passed its full scrollHeight will fully scroll that internal scroller and then extend out (chain) up to the ancestor scroller, but not initiate the snapping behavior that is on the ancestor scroller. The video shows that this can leave the ancestor scroller resolving at a position that isn't a snap position.

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