[Webkit-unassigned] [Bug 276451] New: RenderLayer::collectLayers uses compositing state which isn't valid yet

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276451

            Bug ID: 276451
           Summary: RenderLayer::collectLayers uses compositing state
                    which isn't valid yet
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

RenderLayer::collectLayers decides whether to include layers inside visibility:hidden based on `compositor().usesCompositing()`, which isn't (guaranteed to be) computed until after compositing layers have been decided.

If the compositing state does change, nothing invalidates the RenderLayer z-order lists, so we can remain in this unexpected state.

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