rem: }; }; 
add: } } 
context: qx.Proto.getIndentSymbol = function(vUseTreeLines, vIsLastColumn){  if (vUseTreeLines)  {    if (vIsLastColumn)    {      return this.isLastChild() ? "end" : "cross";    }    else    {      return "line";    };  };  return null;};
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