anchor.diff:      dataMenuItemsUrl = $(document.body).attr('data-atwho-menu-items');
       // Default selected filter when using '#'
       DEFAULT_SEARCH_FILTER = 'sam';
  +    atWhoUpdating = false;
   
       // helper methods for AtWho callback
       function _templateEval(_tpl, map) {
  
positive.code:         dataSampleUrl,
          dataMenuItemsUrl,
          prevAt,
          DEFAULT_SEARCH_FILTER;
  
      dataUserUrl = $(document.body).attr('data-atwho-users-url');
      dataTaskUrl = $(document.body).attr('data-atwho-task-url');
  
negative.code:             var searchFilter = $('.atwho-view[style] .btn-primary')
                                  .data('filter');
  
              // Hack for preventing second execution of this callback, triggered
              // when user switches to different AtWho listener (e.g. from # to
              // task#), which causes both of them to be called. In such case,
              // AtWHO modal needs to be rerendered.
              if(atWhoUpdating || (!$(field).length && _.isUndefined(searchFilter))) {
                setTimeout(function() {
                  $(field).atwho('run');
                }, 100);
                return;
              }
  
              atWhoUpdating = true;
              setTimeout(function() {
                if (_.isUndefined(searchFilter)) {
                  searchFilter = defaultSearchFilter;
                }
                if(prevAt != at) {
                  prevAt = at;
                  $('.atwho-view[style]').removeAttr("style");
                  searchFilter = defaultSearchFilter;
                }
  
                var dataUrl;
                switch(searchFilter) {
                  case 'tsk':
                      dataUrl = dataTaskUrl;
                      break;
                  case 'prj':
                      dataUrl = dataProjectUrl;
                      break;
                  case 'exp':
                      dataUrl = dataExperimentUrl;
                      break;
                  case 'sam':
                      dataUrl = dataSampleUrl;
                      break;
                }
  
                $.getJSON(
                  dataUrl,
                  {query: query},
                  function(data) {
                    callback(data.res);
                    initButtons(query, searchFilter);
                  }
                );
                atWhoUpdating = false;
              }, 100);
            },
            tplEval: function(_tpl, map) {
              return _templateEval(_tpl, map);
  