[Webkit-unassigned] [Bug 180002] New: ScrollingStateNode::reconcileLayerPositionForViewportRect always starts from the root node

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180002

            Bug ID: 180002
           Summary: ScrollingStateNode::reconcileLayerPositionForViewportR
                    ect always starts from the root node
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: simon.fraser at apple.com
            Blocks: 149264, 171667

Created attachment 327541

  --> https://bugs.webkit.org/attachment.cgi?id=327541&action=review

Patch

In bug 179946, I'm mentioning that reconcileLayerPositionForViewportRect does not affect children deeper than the root node. Additionally, when the function is called for subframes, the "reconcile layer position" is still only applied from the root node, not the subframe node.

The attached patch tries to address that. However, as in bug 179946 I'm not sure about an effect of reconcileLayerPositionForViewportRect that I can test. I tried my patch with the experimental macOS async frame scrolling but still can not see any difference.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=149264
[Bug 149264] IFrame scrolling=yes is ignored in iOS Safari
https://bugs.webkit.org/show_bug.cgi?id=171667
[Bug 171667] [Mac] Make frames fast-scrollable
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