Issue 318925: Copy and paste sometimes removes spaces between words

Source/core/editing/TextIterator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov.
  *
  * 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
@@ skipping 241 matching lines @@
     , m_sortedTextBoxesPosition(0)
     , m_emitsCharactersBetweenAllVisiblePositions(behavior & TextIteratorEmitsCharactersBetweenAllVisiblePositions)
     , m_entersTextControls(behavior & TextIteratorEntersTextControls)
     , m_emitsOriginalText(behavior & TextIteratorEmitsOriginalText)
     , m_handledFirstLetter(false)
     , m_ignoresStyleVisibility(behavior & TextIteratorIgnoresStyleVisibility)
     , m_stopsOnFormControls(behavior & TextIteratorStopsOnFormControls)
     , m_shouldStop(false)
     , m_emitsImageAltText(behavior & TextIteratorEmitsImageAltText)
     , m_entersAuthorShadowRoots(behavior & TextIteratorEntersAuthorShadowRoots)
+    , m_hasNodesFollowing(behavior & TextIteratorBehavesAsIfNodesFollowing)
 {
     if (!range)
         return;
 
     // get and validate the range endpoints
     Node* startContainer = range->startContainer();
     if (!startContainer)
         return;
     int startOffset = range->startOffset();
     Node* endContainer = range->endContainer();
@@ skipping 384 matching lines @@
 
         if (runStart < runEnd) {
             // Handle either a single newline character (which becomes a space),
             // or a run of characters that does not include a newline.
             // This effectively translates newlines to spaces without copying the text.
             if (str[runStart] == '\n') {
                 emitCharacter(' ', m_node, 0, runStart, runStart + 1);
                 m_offset = runStart + 1;
             } else {
                 size_t subrunEnd = str.find('\n', runStart);
-                if (subrunEnd == kNotFound || subrunEnd > runEnd)
+                if (subrunEnd == kNotFound || subrunEnd > runEnd) {
                     subrunEnd = runEnd;
-
+                    bool lastSpaceCollapsedByNextNonTextBox = !nextTextBox && m_hasNodesFollowing && (str.length() > runEnd);
+                    if (lastSpaceCollapsedByNextNonTextBox)
+                        subrunEnd++; // runEnd stopped before last space. Increment by one to restore the space.
+                }
                 m_offset = subrunEnd;
                 emitText(m_node, renderer, runStart, subrunEnd);
             }
 
             // If we are doing a subrun that doesn't go to the end of the text box,
             // come back again to finish handling this text box; don't advance to the next one.
             if (static_cast<unsigned>(m_positionEndOffset) < textBoxEnd)
                 return;
 
             // Advance and return
@@ skipping 1398 matching lines @@
         if (!matchLength)
             return collapsedToBoundary(range, !(options & Backwards));
     }
 
     // Then, find the document position of the start and the end of the text.
     CharacterIterator computeRangeIterator(range, TextIteratorEntersTextControls | TextIteratorEntersAuthorShadowRoots);
     return characterSubrange(computeRangeIterator, matchStart, matchLength);
 }
 
 }