Adding Node.insertAllBefore

tools/dom/templates/html/impl/impl_Node.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 52 matching lines @@
     _this.$dom_appendChild(value);
   }
 
   void addLast(Node value) {
     _this.$dom_appendChild(value);
   }
 
 
   void addAll(Iterable<Node> iterable) {
     if (iterable is _ChildNodeListLazy) {
-      if (iterable._this != _this) {
+      if (!identical(iterable._this, _this)) {
         // Optimized route for copying between nodes.
         for (var i = 0, len = iterable.length; i < len; ++i) {
+          // Should use $dom_firstChild, Bug 8886.
           _this.$dom_appendChild(iterable[0]);
         }
       }
       return;
     }
     for (Node node in iterable) {
       _this.$dom_appendChild(node);
     }
   }
 
@@ skipping 198 matching lines @@
   Node replaceWith(Node otherNode) {
     try {
       final Node parent = this.parentNode;
       parent.$dom_replaceChild(otherNode, this);
     } catch (e) {
 
     };
     return this;
   }
 
+  /**
+   * Inserts all of the nodes into this node directly before refChild.
+   *
+   * See also:
+   *
+   * * [insertBefore]
+   */
+  Node insertAllBefore(Iterable<Node> newNodes, Node refChild) {
+    if (newNodes is _ChildNodeListLazy) {
+      if (identical(newNodes._this, this)) {
+        throw new ArgumentError(newNodes);
+      }
+
+      // Optimized route for copying between nodes.
+      for (var i = 0, len = newNodes.length; i < len; ++i) {
+        // Should use $dom_firstChild, Bug 8886.
+        this.insertBefore(newNodes[0], refChild);
+      }
+    } else {
+      for (var node in newNodes) {
+        this.insertBefore(node, refChild);
+      }
+    }
+  }
+
 $!MEMBERS
 }