add: Draggables._lastScrollPointer = null; 
context:   stopScrolling: function() {    if(this.scrollInterval) {      clearInterval(this.scrollInterval);      this.scrollInterval = null;    }  },
meta: 883	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/883/bb2276098a5a21c35e5ee72b3097bd9d7caa919f/dragdrop.js/clean/actionpack/lib/action_view/helpers/javascripts/dragdrop.js