anchor.diff:      }
   
       function init() {
  +      // Default selected filter when using '#'
  +      var DEFAULT_SEARCH_FILTER = 'sam';
  +
         $(field)
         .atwho({
           at: '@',
  
positive.code:     }
  
      // Initialize or update filter buttons
      function initButtons(query, search_filter) {
        initDismissButton();
        resourcesChecker(query, search_filter);
  
        $('.atwho-header-res .title button').off();
        $('.atwho-header-res .title button').on('click', function(e) {
  
negative.code:                 $element
                    .removeClass('btn-primary')
                    .addClass('btn-default');
                  $('[data-filter="' + searchFilter +'"]')
                    .removeClass('btn-default')
                    .addClass('btn-primary');
                } else {
                  $element.prop('disabled', false);
                  if($element.data('filter') == searchFilter) {
                    $element
                      .removeClass('btn-default')
                      .addClass('btn-primary');
  