rem: this.field.on("focus", function(){this.dom.select();}); 
add: return function(v){ if(v !== last){ last = v; return v - diff; } } 
context:         this.field.on("focus", function(){this.dom.select();});
meta: 2891	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2891/d109eea1e59fbb030ac98e95f181f72da9611a48/ext-all-debug.js/buggy/gemma-web/src/main/webapp/scripts/ext/ext-all-debug.js