[Webkit-unassigned] [Bug 197863] New: Overlap testing be constrained within a stacking-context overflow:scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197863

            Bug ID: 197863
           Summary: Overlap testing be constrained within a
                    stacking-context overflow:scroll
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

When testing layers for overlap with an async overflow scroll, we should:
1. Not clip to the overflow scroll bounds when computing overlap bounds within the scroller, because this causes compositing state changes when you scroll, which flashes
2. Not let the bounds of layers inside the overflow:scroll leak out, which would trigger additional compositing of things outside the overflow.

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