rem: if (this.parentRecord) 
add: if ("parentRecord" in this) 
context: function tovr_open (){    if (this.isContainerOpen)        return;    if (this.onPreOpen)        this.onPreOpen();        this.isContainerOpen = true;    var delta = 0;    for (var i = 0; i < this.childData.length; ++i)    {        if (!this.childData[i].isHidden)            delta += this.childData[i].visualFootprint;    }    this.resort(true);    this.visualFootprint += delta;    if (this.parentRecord)        this.parentRecord.onVisualFootprintChanged(this.calculateVisualRow(),                                                   delta);}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/b243396c405e4eee825cfde1ffa0dd7a6caf0e83/tree-utils.js/clean/extensions/venkman/resources/content/tree-utils.js