Whitespace only text nodes need to be reattached when their siblings are reattached

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index e08d54e55da2f5c90cd28f11b6e491676b43b89a..7bac0d8efa01fb8e92b970026ec7b548fa11fd01 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -997,6 +997,16 @@ void Node::detach(const AttachContext& context)
 #endif
 }
 
+void Node::reattachWhitespaceSiblings() const
+{
+    for (Node* sibling = nextSibling(); sibling; sibling = sibling->nextSibling()) {
+        if (sibling->isTextNode() && toText(sibling)->containsOnlyWhitespace())
+            sibling->reattach();
+        else if (sibling->renderer())
+            return;
+    }
+}
+
 // FIXME: This code is used by editing.  Seems like it could move over there and not pollute Node.
 Node *Node::previousNodeConsideringAtomicNodes() const
 {