code: function goNextPrevDoc(inc, listOrder) {
          var result;
          if (listOrder) {
              result = MainViewManager.traverseToNextViewInListOrder(inc);
          } else {
              result = MainViewManager.traverseToNextViewByMRU(inc);
          }
  
          if (result) {
              var file = result.file,
                  paneId = result.paneId;
  
              MainViewManager.beginTraversal();
              CommandManager.execute(Commands.FILE_OPEN, {fullPath: file.fullPath,
                                                          paneId: paneId });
  
              // Listen for ending of Ctrl+Tab sequence
              if (!_addedNavKeyHandler) {
                  _addedNavKeyHandler = true;
                  $(window.document.body).keyup(detectDocumentNavEnd);
              }
          }
      }
docs: Navigate to the next/previous (MRU or list order) document. Don't update MRU order yet
  @param {!number} inc Delta indicating in which direction we're going
  @param {?boolean} listOrder Whether to navigate using MRU or list order. Defaults to MRU order