[Webkit-unassigned] [Bug 193665] [iOS] Tiles not created in large scrollable iframes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193665

--- Comment #7 from Antti Koivisto <koivisto at iki.fi> ---
We should clarify which layer moves during scrolling. The regular code paths assume that the scrollLayer (in scrolling tree and elsewhere) is the one that moves. UIScrollView code paths assume scrollLayer is the UIScrollView (so just clips) and the scrolledContentsLayer is the one that moves.

The code would be much clearer and require fewer exceptions if we (for example) made the clip layer to be the UIScrollView and let scrollLayer be its moving child layer.

This would need to be matched in both overflow and frame code.

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