Stop tracking trailing-space when we leave it

third_party/WebKit/Source/core/layout/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * 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.
@@ skipping 594 matching lines @@
         font.width(constructTextRun(font, &spaceCharacter, 1, style, style.direction())) + wordSpacing
         : 0;
 
     UChar lastCharacter = m_layoutTextInfo.m_lineBreakIterator.lastCharacter();
     UChar secondToLastCharacter = m_layoutTextInfo.m_lineBreakIterator.secondToLastCharacter();
     for (; m_current.offset() < layoutText.textLength(); m_current.fastIncrementInTextNode()) {
         bool previousCharacterIsSpace = m_currentCharacterIsSpace;
         UChar c = m_current.current();
         m_currentCharacterIsSpace = c == spaceCharacter || c == tabulationCharacter || (!m_preservesNewline && (c == newlineCharacter));
 
-        if (!m_collapseWhiteSpace || !m_currentCharacterIsSpace)
+        if (!m_collapseWhiteSpace || !m_currentCharacterIsSpace) {
             m_lineInfo.setEmpty(false, m_block, &m_width);
+            m_width.setTrailingWhitespaceWidth(0);
+        }
 
         if (c == softHyphenCharacter && m_autoWrap && !hyphenWidth) {
             hyphenWidth = layoutText.hyphenWidth(font, textDirectionFromUnicode(m_resolver.position().direction()));
             m_width.addUncommittedWidth(hyphenWidth);
         }
 
         bool applyWordSpacing = false;
 
         // Determine if we should try breaking in the middle of a word.
         if (breakWords && !midWordBreak && !U16_IS_TRAIL(c)) {
@@ skipping 352 matching lines @@
 
     if (style.getTextIndentType() == TextIndentHanging)
         indentText = indentText == IndentText ? DoNotIndentText : IndentText;
 
     return indentText;
 }
 
 } // namespace blink
 
 #endif // BreakingContextInlineHeaders_h