[Webkit-unassigned] [Bug 196724] New: Sticky-positioned element inside async overflow:scroll moves incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196724

            Bug ID: 196724
           Summary: Sticky-positioned element inside async overflow:scroll
                    moves incorrectly
           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

For position:-webkit-sticky inside async overflow:scroll, there are several scenarios that we have to deal with:
1. Compositing ancestor is some ancestor outside the overflow:scroll
2. Compositing ancestor is the overflow:scroll (works OK now)
3. Compositing ancestor is an element inside the overflow:scroll

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