[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 #2 from jonjohnjohnson <hi at jonjohnjohnson.com> ---
Created attachment 359171

  --> https://bugs.webkit.org/attachment.cgi?id=359171&action=review

scroll snapped outter scroller blocked by inner scroller at boundary

I *think this test case narrows down the original real world ui test case I previously attached.

1. Scroll downwards with mouse over green area. This scrolls a scroll snapping outer container.
2. Watch as it snaps to the second/last page of it's content.
3. Scroll downwards with mouse over striped area. This scrolls an internal scroll container.
4. Let internal scroll resolve at bottom boundary, then scroll back up to the top boundary.
5. Try as you might to continue scrolling upwards from above the striped area, you will not be able to scroll back up to the first page of the outer scroll snapping container.

fred.wang at free.fr I think this is the culprit of the tangential issue described in https://bugs.webkit.org/show_bug.cgi?id=191816

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