title: Cannot write in text box while it's autosaving using tinymce-4 plugin
body: <p>I am using a plugin to autosave a textbox. However, when the autosave function is called, the text box cannot be typed into. I want users to be able to continue typing while the auto save is posted via AJAX.</p>
  
  <pre><code>tinymce.PluginManager.add('jsave', function(editor) {
  
  // Get the form element into a jQuery object.
  var $form = $(editor.formElement);
  
  // Settings for initialization.
  var settings = {
      // Interval to execute the function. Default is 15000 (ms 1000 = 1 second).
      //seconds: editor.getParam('jsave_seconds') || 2000,
      seconds: 2000,
      // This is our url that we will send data. If you want to have two different links,
      // one for ajax and one for manual post this setting is pretty useful!
      url: editor.getParam('jsave_url') || $form.attr('action'),
      // This is the callback that will be executed after the form is submitted
      callback: editor.getParam('jsave_callback')
  };
  $('.form_header,#attachbox').change(function (){
          tinymce.get('mail_body').isNotDirty=0;
          $("#save_status").html("Not saved");
  });
  var interval = setInterval(function() {
      // Quit the function if the editor is not dirty.
      if (!editor.isDirty()){
          return;
      }
  
      // Update the original textarea
      editor.save();
  
      // Create a data string from form elements.
      ds =$form.serialize();
      // $form.find(':input').each(function (i, el) {
      // $el = $(el); 
      // if($el.attr('name')!=null)
      // ds[$el.attr('name')] = $el.val(); }
      // );
  
      $("#save_status").html("Saving");
      $.ajax({
          url: settings.url,
          type: $form.attr('method'),
          data: ds,
          dataType:"json",
          async:false,
          success: function(msg) {
              if (settings.callback){
                  //editor.setContent(msg.draft_body);
                  $("#save_status").html("Saved");
                  settings.callback(msg);
              }
              else{
                  $("#save_status").html("Saving error");
                  console.log(msg);
              }
          }
      });
  
  }, settings.seconds);
  }); //vsk.me/en/28/adding-an-autosave-plugin-to-tinymce-2#sthash.jsOruJSd.dpuf
  </code></pre>