code: function _reinstateMarkers(editor, frames) {
          var index, frame;
          for (index in frames) {
              frame = frames[index];
              if (!frame.cm && frame.filePath === editor.document.file._path) {
                  frame._reinstateMarkers(editor);
              }
          }
      }
docs: Required to make offline markers alive again to track document mutation
  @private