[Webkit-unassigned] [Bug 194996] New: Scrolling tree should do an update after layer flushing on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194996

            Bug ID: 194996
           Summary: Scrolling tree should do an update after layer
                    flushing on macOS
           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

The scrolling tree contains the latest scrolling-related state for layers managed by the scrolling tree. When the main thread flushes compositing layers, it might flush layer positions that are stale in relation to the scrolling thread state. We currently (mostly) avoid jank here by the tricky "set or sync" logic, and "isInUserScroll" state, but it would be simpler to just have the scrolling tree do a pass after layer flushing.

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