Handle multiple fragments in the getCharNumberAtPosition SVGTextQuery

Source/core/rendering/svg/SVGTextQuery.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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
  * 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
@@ skipping 500 matching lines @@
     {
     }
 
     FloatPoint position;
 };
 
 bool SVGTextQuery::characterNumberAtPositionCallback(Data* queryData, const SVGTextFragment& fragment) const
 {
     CharacterNumberAtPositionData* data = static_cast<CharacterNumberAtPositionData*>(queryData);
 
+    // Offset of the fragment within the text box.
+    unsigned boxOffset = fragment.characterOffset - queryData->textBox->start();
+
     FloatRect extent;
     for (unsigned i = 0; i < fragment.length; ++i) {
-        int startPosition = data->processedCharacters + i;
+        int startPosition = data->processedCharacters + boxOffset + i;
         int endPosition = startPosition + 1;
         if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startPosition, endPosition))
             continue;
 
         calculateGlyphBoundaries(queryData, fragment, startPosition, extent);
         if (extent.contains(data->position)) {
-            data->processedCharacters += i;
+            data->processedCharacters += boxOffset + i;
             return true;
         }
     }
 
     return false;
 }
 
 int SVGTextQuery::characterNumberAtPosition(const FloatPoint& position) const
 {
     if (m_textBoxes.isEmpty())
         return -1;
 
     CharacterNumberAtPositionData data(position);
     if (!executeQuery(&data, &SVGTextQuery::characterNumberAtPositionCallback))
         return -1;
 
     return data.processedCharacters;
 }
 
 }