[Webkit-unassigned] [Bug 198532] Sticky positioning is jumpy in many overflow cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198532

Simon Fraser (smfr) <simon.fraser at apple.com> changed:

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--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 371290
  --> https://bugs.webkit.org/attachment.cgi?id=371290
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=371290&action=review

> Source/WebCore/page/scrolling/cocoa/ScrollingTreeStickyNode.mm:89
> +                    auto overflowNode = scrollingTree().nodeForID(positioningAncestor.relatedOverflowScrollingNodes()[0]);

Are you guaranteed to have positioningAncestor.relatedOverflowScrollingNodes ?

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