[Webkit-unassigned] [Bug 194179] Clarify layer nomenclature for the root scrolling layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194179

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
I don't think we need "overflow controls host" on iOS. The UIScrollView should equate to the scrollContainerLayer, and the "content root" to the scrolledContentsLayer I think (though UIKit may add other children to the UIScrollView.

Wherever we set the scroll position on a scrollable thing, we need to pass both the scrollContainerLayer and the scrolledContentsLayer, and for iOS set the bounds origin on the scrollContainerLayer, and on macOS set the position on the scrolledContentsLayer.

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