[Webkit-unassigned] [Bug 210443] New: Implement layer-based custom scrollbars

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210443

            Bug ID: 210443
           Summary: Implement layer-based custom scrollbars
           Product: WebKit
           Version: Safari Technology Preview
          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

Custom scrollbars are currently just painted into the scroller's backing store. I'll fix that so they get painted into their own layers, but longer term we want to make a layer for the thumb, at least, so we can move it on the scrolling thread.

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