rem: if (this._treeView && this._treeView.outliner) 
add: if ("_treeView" in this && "outliner" in this._treeView) 
context: function torr_vfpchange (start, amount){    this.invalidateCache();    this.visualFootprint += amount;    if (this._treeView && this._treeView.outliner)    {        if (amount != 0)            this._treeView.outliner.rowCountChanged (start, amount);        else            this._treeView.outliner.invalidateRow (start);    }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/e711edc14f9f9f43c8fc7d007226dcc5ca78ab65/tree-utils.js/clean/extensions/venkman/resources/content/tree-utils.js