title: Missing post data when updating Select options with JQuery
body: <p>I have two selects in a form:</p>
  
  <ul>
  <li><code>input_licensee_list</code>: filled with possible options (Using an Ajax call)</li>
  <li><code>output_licensee_list</code>: to get the selection from the user.</li>
  </ul>
  
  <p>When I post the form, I get the list in <code>output_licensee_list</code>.</p>
  
  <p>For this I added two buttons: Add (Move selected options from input to output), and Add All (Move all options from input to output).</p>
  
  <pre><code>// Add all button: remove all entries from input list and add them to output list
  add_all_button.on('click', function (e) {
      var options = input_licensee_list.find("option").remove();
      options.append(' (' + group_selection.find("option:selected").text() + ')');
      options.appendTo(output_licensee_list);
      output_licensee_list.trigger('change');
      input_licensee_list.trigger('change');
  });
  
  // Add button: remove selected entries from input list and add them to output list
  add_button.on('click', function (e) {
      var options = input_licensee_list.find("option:selected").remove();
      options.append(' (' + group_selection.find("option:selected").text() + ')');
      options.appendTo(output_licensee_list);
      output_licensee_list.trigger('change');
      input_licensee_list.trigger('change');
  });
  </code></pre>
  
  <p>I have prepared a JSFiddle to show it:</p>
  
  <p><a href="https://jsfiddle.net/zaun8qgp/4/" rel="nofollow">https://jsfiddle.net/zaun8qgp/4/</a></p>
  
  <p>The JQuery code itself seems to work fine, and the form is posted correctly if I use the "Add" button (Even if I select all options).</p>
  
  <p>However for some reason, if I use the "Add all" button:</p>
  
  <ul>
  <li>The input <code>output_licensee_list</code> does not appear in the POST at all, so I do not get any information from it;</li>
  <li>If I use "Add", then "Add all", the information I get in the post if the list I initially added (before the Add All).</li>
  </ul>
  
  <p>If anyone has clues on why it does not work correctly, or how I can debug more, I would appreciate !</p>