rem: }; 
add: } 
context: qx.Proto.setColumns = function(columnNameArr, columnIdArr) {  if (columnIdArr == null) {    columnIdArr = columnNameArr;  }  if (columnIdArr.length != columnNameArr.length) {    throw "columnIdArr and columnNameArr have different length: "      + columnIdArr.length + " != " + columnNameArr.length;  }  this._internalChange = true;  this.setColumnIds(columnIdArr);  this._internalChange = false;  this.setColumnNamesByIndex(columnNameArr);};
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