[Webkit-unassigned] [Bug 197864] New: Compositing overlap testing doesn't handle non-stacking context overflow scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197864

            Bug ID: 197864
           Summary: Compositing overlap testing doesn't handle
                    non-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

With a non-stacking-context overflow scroll, we want to avoid re-computing compositing while scrolling (so not clip overflow bounds to the scroller's bounds), but we have to avoid triggering compositing of elements that are outside the scroller, but siblings in z-order.

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