[Webkit-unassigned] [Bug 196508] New: Async overflow scroll on iOS paints slowly if it has a negative z-index child

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196508

            Bug ID: 196508
           Summary: Async overflow scroll on iOS paints slowly if it has a
                    negative z-index child
           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

Created attachment 366531

  --> https://bugs.webkit.org/attachment.cgi?id=366531&action=review

Testcase

We seem to get the clipping wrong when painting if we have a negative z-index child.

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