Fix line break at element boundary when 8bit element follows 16bit

third_party/WebKit/Source/platform/text/TextBreakIterator.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2011 Google Inc. 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 237 matching lines @@
 
 template <typename CharacterType, LineBreakType lineBreakType>
 static inline int nextBreakablePosition(
     LazyLineBreakIterator& lazyBreakIterator,
     const CharacterType* str,
     unsigned length,
     int pos) {
   int len = static_cast<int>(length);
   int nextBreak = -1;
 
-  CharacterType lastLastCh =
-      pos > 1 ? str[pos - 2] : static_cast<CharacterType>(
-                                   lazyBreakIterator.secondToLastCharacter());
-  CharacterType lastCh =
-      pos > 0 ? str[pos - 1]
-              : static_cast<CharacterType>(lazyBreakIterator.lastCharacter());
+  UChar lastLastCh =
+      pos > 1 ? str[pos - 2] : lazyBreakIterator.secondToLastCharacter();
+  UChar lastCh = pos > 0 ? str[pos - 1] : lazyBreakIterator.lastCharacter();
   ULineBreak lastLineBreak;
   if (lineBreakType == LineBreakType::BreakAll)
     lastLineBreak = lineBreakPropertyValue(lastLastCh, lastCh);
   unsigned priorContextLength = lazyBreakIterator.priorContextLength();
   for (int i = pos; i < len; i++) {
     CharacterType ch = str[i];
 
     if (isBreakableSpace(ch) || shouldBreakAfter(lastLastCh, lastCh, ch))
       return i;
 
@@ skipping 109 matching lines @@
 
 int LazyLineBreakIterator::nextBreakablePositionKeepAll(int pos) {
   if (m_string.is8Bit())
     return nextBreakablePosition<LChar, LineBreakType::Normal>(
         *this, m_string.characters8(), m_string.length(), pos);
   return nextBreakablePositionKeepAllInternal(*this, m_string.characters16(),
                                               m_string.length(), pos);
 }
 
 }  // namespace blink