[Webkit-unassigned] [Bug 197837] New: GraphicsLayer contentsVisible property miscomputed when using backing sharing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197837

            Bug ID: 197837
           Summary: GraphicsLayer contentsVisible property miscomputed
                    when using backing sharing
           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: koivisto at iki.fi

The attached test case produces layer tree

(GraphicsLayer
  (anchor 0.00 0.00)
  (bounds 800.00 600.00)
  (deep color 1)
  (children 1
    (GraphicsLayer
      (bounds 800.00 600.00)
      (contentsOpaque 1)
      (deep color 1)
      (children 2
        (GraphicsLayer
          (position 8.00 8.00)
          (bounds 500.00 500.00)
          (contentsOpaque 1)
          (deep color 1)
        )
        (GraphicsLayer
          (position 30.00 30.00)
          (bounds 250.00 250.00)
          (drawsContent 1)
          (contentsVisible 0)
          (deep color 1)
        )
      )
    )
  )
)

The layer with (contentsVisible 0) has visible contents in backing sharing descendants.

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