Fixed initializing the indexes of an expanded array after duplicating the array.

demo.html

@@ -12,7 +12,7 @@
     <button onclick="setJSON();">Set JSON</button>
     <button onclick="getJSON();">Get JSON</button>
 </p>
-<div id="jsoneditor" style="width: 500px; height: 200px;"></div>
+<div id="jsoneditor" style="width: 500px; height: 400px;"></div>
 
 <script type="text/javascript" >
     // create the editor. Optionally, parameters json and options can be

jsoneditor/jsoneditor.js

@@ -1746,7 +1746,7 @@ JSONEditor.Node.prototype.getDom = function() {
     dom.tree = this._createDomTree();
     tdField.appendChild(dom.tree);
 
-    this.updateDom(); // TODO: recurse here?
+    this.updateDom({'updateIndexes': true});
 
     return dom.tr;
 };