anchor.diff:          dataProjectUrl,
           dataExperimentUrl,
           dataSampleUrl,
  -        dataMenuItemsUrl;
  +        dataMenuItemsUrl,
  +        prevAt,
  +        DEFAULT_SEARCH_FILTER;
   
       dataUserUrl = $(document.body).attr('data-atwho-users-url');
       dataTaskUrl = $(document.body).attr('data-atwho-task-url');
  
positive.code:       return res;
      }
  
      function init() {
        // Default selected filter when using '#'
        var DEFAULT_SEARCH_FILTER = 'sam';
  
        $(field)
        .atwho({
          at: '@',
  
negative.code: 
        $('.atwho-header-res .title button').off();
        $('.atwho-header-res .title button').on('click', function(e) {
          // Update the selected filter button
          var $selectedBtn = $(this);
          var $prevBtn = $selectedBtn.closest('.title').children('.btn-primary');
  