Copy and paste sometimes removes spaces between words.

Source/core/editing/markup.cpp

Index: Source/core/editing/markup.cpp
diff --git a/Source/core/editing/markup.cpp b/Source/core/editing/markup.cpp
index 7259f474a27ea20a1308d1c8ea6b98530f5ead31..73d574c047292a561b30b6c7ed17f4ed1ef3d908 100644
--- a/Source/core/editing/markup.cpp
+++ b/Source/core/editing/markup.cpp
@@ -263,14 +263,20 @@ String StyledMarkupAccumulator::renderedText(Node& node, const Range* range)
     unsigned startOffset = 0;
     unsigned endOffset = textNode.length();
 
-    if (range && textNode == range->startContainer())
-        startOffset = range->startOffset();
-    if (range && textNode == range->endContainer())
-        endOffset = range->endOffset();
+    TextIteratorBehavior behavior = TextIteratorDefaultBehavior;
+    if (range) {
+        if (textNode == range->startContainer())
+            startOffset = range->startOffset();
+
+        if (textNode == range->endContainer())
+            endOffset = range->endOffset();
+        else
+            behavior = TextIteratorBehavesAsIfNodesFollowing;
+    }
 
     Position start = createLegacyEditingPosition(&textNode, startOffset);
     Position end = createLegacyEditingPosition(&textNode, endOffset);
-    return plainText(Range::create(textNode.document(), start, end).get());
+    return plainText(Range::create(textNode.document(), start, end).get(), behavior);
 }
 
 String StyledMarkupAccumulator::stringValueForRange(const Node& node, const Range* range)