[Webkit-unassigned] [Bug 282215] New: WebCore's main thread scroll position is poorly synchronized with the UI-process scroll position

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282215

            Bug ID: 282215
           Summary: WebCore's main thread scroll position is poorly
                    synchronized with the UI-process scroll position
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

Som page effects rely on the main thread scroll position in WebCore code, for example painting of `background-attachment:fixed` content on a non-root element, and JS-driven fake fixed and sticky elements.

With UI-side compositing, the synchronization between the UI-process and web process scroll positions is worse than it should be.

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