code: function getWorkingSet() {
          DeprecationWarning.deprecationWarning("Use MainViewManager.getWorkingSet() instead of DocumentManager.getWorkingSet()", true);
          return MainViewManager.getWorkingSet(MainViewManager.ALL_PANES)
              .filter(function (file) {
                  // Legacy didn't allow for files with custom viewers
                  return !MainViewFactory.findSuitableFactoryForPath(file.fullPath);
              });
      }
docs: Returns a list of items in the working set in UI list order. May be 0-length, but never null.
  @deprecated Use MainViewManager.getWorkingSet() instead
  @return {Array.<File>}