anchor.diff:    </div>
     <div id='track_courses' >
       <div class='links'>
  -      <%= link_to_add_association 'Add Course to Track', f, :track_courses, :class => "btn btn-raised" %>
  +      <%= link_to_add_association 'Add Course to Track', f, :track_courses, :class => "btn" %>
       </div>
       <h4>Courses:</h4>
       <div class="course_fields sortable">
  
positive.code:     // then remove
      var template = `<%= load_track_course_form_view(nil) %>`;
      function reorder(){
        track_courses_sort.sortable();
        updateNestedfields();
      };
      searchable_input(insertedItem.clone(), "#track_courses .course_fields",
  
negative.code:     set_positions();
    };
  
    var track_courses_sort = '#track_courses .sortable';
  
    sortable(track_courses_sort, {
      items: ".nested-fields",
      hoverClass: 'sortable-item-hover'
    })[0].addEventListener('sortupdate', function(e) {
        updateNestedfields();
    });
    set_positions();
  