[Webkit-unassigned] [Bug 199321] New: REGRESSION (r239984): pages with custom scrollbars also show normal scrollbars

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199321

            Bug ID: 199321
           Summary: REGRESSION (r239984): pages with custom scrollbars
                    also show normal scrollbars
           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

and we paint the scrollbars on the main thread, causing flickering.

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