[Webkit-unassigned] [Bug 118712] New: backgroundIsKnownToBeObscured should return false when RenderBox has box-shadow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118712

           Summary: backgroundIsKnownToBeObscured should return false when
                    RenderBox has box-shadow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, koivisto at iki.fi,
                    simon.fraser at apple.com, akling at apple.com


We should probably merge https://chromium.googlesource.com/chromium/blink/+/eda6bbe16cf43ac0369595020ec18114a6316433

box-shadow is painted in paintFillLayers (invoked from paintBackground).
However, if background is known to be obscured, the paintFillLayers will not be invoked.
So if RenderBox has any box-shadow, its backgroundIsKnownToBeObscured should return false.

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