[SVG2] Svg elements that overflow the viewport should also be hitdetected.

Source/core/rendering/svg/RenderSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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
@@ skipping 404 matching lines @@
 {
     SVGRenderSupport::computeContainerBoundingBoxes(this, m_objectBoundingBox, m_objectBoundingBoxValid, m_strokeBoundingBox, m_repaintBoundingBox);
     SVGRenderSupport::intersectRepaintRectWithResources(this, m_repaintBoundingBox);
 }
 
 bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction)
 {
     LayoutPoint pointInParent = locationInContainer.point() - toLayoutSize(accumulatedOffset);
     LayoutPoint pointInBorderBox = pointInParent - toLayoutSize(location());
 
-    // Only test SVG content if the point is in our content box.
+    // Only test SVG content if the point is in our content box, or in case we
+    // don't clip to the viewport, the visual overflow rect.
     // FIXME: This should be an intersection when rect-based hit tests are supported by nodeAtFloatPoint.
-    if (contentBoxRect().contains(pointInBorderBox)) {
+    if (contentBoxRect().contains(pointInBorderBox) || (!shouldApplyViewportClip() && visualOverflowRect().contains(pointInBorderBox))) {
         const AffineTransform& localToParentTransform = this->localToParentTransform();
         if (localToParentTransform.isInvertible()) {
             FloatPoint localPoint = localToParentTransform.inverse().mapPoint(FloatPoint(pointInParent));
 
             for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
                 // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.
                 if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {
                     updateHitTestResult(result, pointInBorderBox);
                     if (!result.addNodeToRectBasedTestResult(child->node(), request, locationInContainer))
                         return true;
@@ skipping 13 matching lines @@
             updateHitTestResult(result, pointInBorderBox);
             if (!result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect))
                 return true;
         }
     }
 
     return false;
 }
 
 }