Introduce nextPositionOf() for VisiblePosition

Source/core/svg/SVGTextContentElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@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,
@@ skipping 172 matching lines @@
     }
 
     if (nchars > numberOfChars - charnum)
         nchars = numberOfChars - charnum;
 
     ASSERT(document().frame());
 
     // Find selection start
     VisiblePosition start(firstPositionInNode(const_cast<SVGTextContentElement*>(this)));
     for (unsigned i = 0; i < charnum; ++i)
-        start = start.next();
+        start = nextPositionOf(start);
 
     // Find selection end
     VisiblePosition end(start);
     for (unsigned i = 0; i < nchars; ++i)
-        end = end.next();
+        end = nextPositionOf(end);
 
     document().frame()->selection().setSelection(VisibleSelection(start, end));
 }
 
 bool SVGTextContentElement::isPresentationAttribute(const QualifiedName& name) const
 {
     if (name.matches(XMLNames::spaceAttr))
         return true;
     return SVGGraphicsElement::isPresentationAttribute(name);
 }
@@ skipping 49 matching lines @@
 
     if (!layoutObject->isSVGText() && !layoutObject->isSVGInline())
         return nullptr;
 
     SVGElement* element = toSVGElement(layoutObject->node());
     ASSERT(element);
     return isSVGTextContentElement(*element) ? toSVGTextContentElement(element) : 0;
 }
 
 }