[Webkit-unassigned] [Bug 199222] [iOS Scrolling] Propagate scrolls to non-nested UIScrollViews

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199222

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

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 Attachment #373104|review?                     |review+
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--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Comment on attachment 373104
  --> https://bugs.webkit.org/attachment.cgi?id=373104
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=373104&action=review

> Source/WebKit/UIProcess/RemoteLayerTree/ios/RemoteLayerTreeViews.mm:141
> +                    if (auto* nonAncestorScrollingNode = host.nodeForID(node->relatedScrollContainerIDs()[0]))

I'm having a hard time convincing myself that using relatedScrollContainerIDs()[0] is correct. What does it mean to have more than one? What is the order?

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