[Webkit-unassigned] [Bug 192840] New: SVGUseElement::findTarget should return nullptr when there is a cycle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192840

            Bug ID: 192840
           Summary: SVGUseElement::findTarget should return nullptr when
                    there is a cycle
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: zimmermann at kde.org

https://trac.webkit.org/changeset/233366 added an early return to updateShadowTree() when there is a cycle
but there is a separate cycle detection for when there is a corresponding element in SVGUseElement::findTarget.

Support detecting a cycle in SVGUseElement::findTarget to consolidate these two cycle detection code paths.

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