SVG objects with same idrefs conflict when under different shadow root

third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/layout/svg/LayoutSVGTextPath.h"
 
 #include "core/layout/svg/SVGLayoutSupport.h"
 #include "core/svg/SVGPathElement.h"
 #include "core/svg/SVGTextPathElement.h"
 #include "platform/graphics/Path.h"
 #include <memory>
 
 namespace blink {
 
-TreeScope& treeScopeForIdResolution(const SVGElement& element) {
-  if (SVGElement* correspondingElement = element.correspondingElement())
-    return correspondingElement->treeScope();
-  return element.treeScope();
-}
-
 PathPositionMapper::PathPositionMapper(const Path& path)
     : m_positionCalculator(path), m_pathLength(path.length()) {}
 
 PathPositionMapper::PositionType PathPositionMapper::pointAndNormalAtLength(
     float length,
     FloatPoint& point,
     float& angle) {
   if (length < 0)
     return BeforePath;
   if (length > m_pathLength)
@@ skipping 10 matching lines @@
                                        const ComputedStyle&) const {
   if (child->isText())
     return SVGLayoutSupport::isLayoutableTextNode(child);
 
   return child->isSVGInline() && !child->isSVGTextPath();
 }
 
 std::unique_ptr<PathPositionMapper> LayoutSVGTextPath::layoutPath() const {
   const SVGTextPathElement& textPathElement = toSVGTextPathElement(*node());
   Element* targetElement = SVGURIReference::targetElementFromIRIString(
-      textPathElement.hrefString(), treeScopeForIdResolution(textPathElement));
+      textPathElement.hrefString(), textPathElement.treeScopeForIdResolution());
 
   if (!isSVGPathElement(targetElement))
     return nullptr;
 
   SVGPathElement& pathElement = toSVGPathElement(*targetElement);
   Path pathData = pathElement.asPath();
   if (pathData.isEmpty())
     return nullptr;
 
   // Spec:  The transform attribute on the referenced 'path' element represents
@@ skipping 12 matching lines @@
       *toSVGTextPathElement(node())->startOffset()->currentValue();
   float textPathStartOffset = startOffset.valueAsPercentage();
   if (startOffset.typeWithCalcResolved() ==
       CSSPrimitiveValue::UnitType::Percentage)
     textPathStartOffset *= pathLength;
 
   return textPathStartOffset;
 }
 
 }  // namespace blink