remove unused code

select2.js

@@ -154,26 +154,7 @@
         });
     }
 
-    /**
-     * filters mouse events so an event is fired only if the mouse moved.
-     *
-     * filters out mouse events that occur when mouse is stationary but
-     * the elements under the pointer are scrolled.
-     */    
-    function installFilteredMouseMove(element) {
-		var context = $(element[0].document);
-		context.on("mousemove", function (e) {
-	        context.data("select2-lastpos", {x: e.pageX, y: e.pageY});
-	    });
-        element.bind("mousemove", function (e) {
-            var lastpos = context.data("select2-lastpos");
-            if (lastpos === undefined || lastpos.x !== e.pageX || lastpos.y !== e.pageY) {
-                $(e.target).trigger("mousemove-filtered", e);
-            }
-        });
-    }
-
-    /**
+     /**
      * Debounces a function. Returns a function that calls the original fn function only if no invocations have been made
      * within the last quietMillis milliseconds.
      *
@@ -422,7 +403,6 @@
             // initialize the container
             this.initContainer();
 
-            //installFilteredMouseMove(this.results);
             this.dropdown.delegate(resultsSelector, "mouseover", this.bind(this.highlightUnderEvent));
 
             installDebouncedScroll(80, this.results);