Optimization in handleStyleSpans() for restricting the for loop to iterate only

Source/core/editing/ReplaceSelectionCommand.cpp

Index: Source/core/editing/ReplaceSelectionCommand.cpp
diff --git a/Source/core/editing/ReplaceSelectionCommand.cpp b/Source/core/editing/ReplaceSelectionCommand.cpp
index f86777b2ee129597dcadf87fefacdf53da26695b..39f6c41db951380ae6891917fa5676279ac97efd 100644
--- a/Source/core/editing/ReplaceSelectionCommand.cpp
+++ b/Source/core/editing/ReplaceSelectionCommand.cpp
@@ -754,7 +754,8 @@ void ReplaceSelectionCommand::handleStyleSpans(InsertedNodes& insertedNodes)
     // The style span that contains the source document's default style should be at
     // the top of the fragment, but Mail sometimes adds a wrapper (for Paste As Quotation),
     // so search for the top level style span instead of assuming it's at the top.
-    for (Node* node = insertedNodes.firstNodeInserted(); node; node = NodeTraversal::next(*node)) {
+    Node* pastEndNode = insertedNodes.pastLastLeaf();
+    for (Node* node = insertedNodes.firstNodeInserted(); node && node != pastEndNode; node = NodeTraversal::next(*node)) {
         if (isLegacyAppleStyleSpan(node)) {
             wrappingStyleSpan = toHTMLElement(node);
             break;