Block empty space selection

Source/core/editing/VisibleSelection.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 338 matching lines @@
             // Don't do any expansion.
             break;
         case WordGranularity: {
             // General case: Select the word the caret is positioned inside of, or at the start of (RightWordIfOnBoundary).
             // Edge case: If the caret is after the last word in a soft-wrapped line or the last word in
             // the document, select that last word (LeftWordIfOnBoundary).
             // Edge case: If the caret is after the last word in a paragraph, select from the the end of the
             // last word to the line break (also RightWordIfOnBoundary);
             VisiblePosition start = VisiblePosition(m_start, m_affinity);
             VisiblePosition originalEnd(m_end, m_affinity);
+
+            if (!isContentEditable() && isStartOfWordASpace(start)) {
+                start = start.next();
+                if (comparePositions(start, originalEnd) >= 0)
+                    originalEnd = originalEnd.next();
+            }

[Yuta Kitamura, 2014/05/07 11:09:08]

It's totally unclear to me why |start| and |end| need to be
updated in this fashion.

+
             EWordSide side = RightWordIfOnBoundary;
             if (isEndOfEditableOrNonEditableContent(start) || (isEndOfLine(start) && !isStartOfLine(start) && !isEndOfParagraph(start)))
                 side = LeftWordIfOnBoundary;
             m_start = startOfWord(start, side).deepEquivalent();
             side = RightWordIfOnBoundary;
             if (isEndOfEditableOrNonEditableContent(originalEnd) || (isEndOfLine(originalEnd) && !isStartOfLine(originalEnd) && !isEndOfParagraph(originalEnd)))
                 side = LeftWordIfOnBoundary;
 
             VisiblePosition wordEnd(endOfWord(originalEnd, side));
             VisiblePosition end(wordEnd);
@@ skipping 455 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const WebCore::VisibleSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif