add: if (index < 0) return;  
context: function EnsureRowInThreadOutlinerIsVisible(index){  var outliner = GetThreadOutliner();  outliner.boxObject.QueryInterface(Components.interfaces.nsIOutlinerBoxObject).ensureRowIsVisible(index); }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/abd5d148c5b1317060025652778343f5e8a9b6f9/threadPane.js/buggy/mailnews/base/resources/content/threadPane.js