[Webkit-unassigned] [Bug 121889] New: scrollbyRecursively does not the appropriate layer when the initial layer is not scrollable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=121889

           Summary: scrollbyRecursively does not the appropriate layer
                    when the initial layer is not scrollable
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: roger_fong at apple.com
                CC: bdakin at apple.com, bfulgham at webkit.org,
                    simon.fraser at apple.com, jonlee at apple.com


This applies to anything that uses RenderLayer::scrollbyRecursive to scroll and where the initial caller of the method is a layer that is not scrollable and has no overflow clip.

The win port uses this for scrolling in response to a panning gesture.

If a layer that for which hasOverflowCiip returns false is first touched when intiating the pan we end up just scrolling the main document.

This is because the method doesn't appropriately recursively search up the RenderLayer tree.  It should walk up the RenderLayer tree in its entirety and not decide to just bail as soon as we reach a layer that has no overflow clip.

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