Issue 318925: Copy and paste sometimes removes spaces between words

Source/core/editing/TextIterator.cpp

Index: Source/core/editing/TextIterator.cpp
diff --git a/Source/core/editing/TextIterator.cpp b/Source/core/editing/TextIterator.cpp
index b85b148eaf9608052ac88662b451df18dd732357..bc1489664e7d454106a0d2535660358d49b5cf85 100644
--- a/Source/core/editing/TextIterator.cpp
+++ b/Source/core/editing/TextIterator.cpp
@@ -259,6 +259,7 @@ TextIterator::TextIterator(const Range* range, TextIteratorBehaviorFlags behavio
     , m_shouldStop(false)
     , m_emitsImageAltText(behavior & TextIteratorEmitsImageAltText)
     , m_entersAuthorShadowRoots(behavior & TextIteratorEntersAuthorShadowRoots)
+    , m_hasNodesFollowing(behavior & TextIteratorBehavesAsIfNodesFollowing)
 {
     if (!range)
         return;
@@ -663,9 +664,12 @@ void TextIterator::handleTextBox()
                 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);
             }