[Webkit-unassigned] [Bug 90633] New: Start off with overlap testing enabled when recursing into an overflow:hidden stacking context layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90633

           Summary: Start off with overlap testing enabled when recursing
                    into an overflow:hidden stacking context layer
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: jchaffraix at webkit.org, dino at apple.com,
                    jamesr at chromium.org, enne at google.com


In RenderLayerCompositor::computeCompositingRequirements(), childState inherits the overlap testing state from the ancestor state (the logic being that if overlap testing is off, we need to keep it off when recursing into descendants).

However, I think we can turn overlap testing on for an overflow:hidden layer that is a stacking context.

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