title: how to use set_id to rename node_id in jstree?
body: <p>this is my rename function, none of the options i've tried work, i do know, that set_id is the function to use but how?</p>
  
  <pre><code> $('#jstree').on('rename_node.jstree', function (node,obj) {
  
      var node_id = "calculated"// calculate node_id
      // tried the following 3 options ..
     ....
  
       $('#jstree').jstree(true).set_id(obj,node_id); //not working
  
       obj.instance.set_id(this,node_id)// not working either
       obj.instance.set_id(obj,node_id)//nope..
  </code></pre>
  
  <p>So how do i set the node_id in jstree?</p>