restore smooth scrolling by fixing mouseevent-filtered

Author: ivaynberg

select2.js

@@ -154,19 +154,19 @@
         });
     }
 
+    $(document).delegate("*", "mousemove", function (e) {
+        $(document).data("select2-lastpos", {x: e.pageX, y: e.pageY});
+    });
+
     /**
      * 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");
+	    element.bind("mousemove", function (e) {
+            var lastpos = $(document).data("select2-lastpos");
             if (lastpos === undefined || lastpos.x !== e.pageX || lastpos.y !== e.pageY) {
                 $(e.target).trigger("mousemove-filtered", e);
             }
@@ -422,8 +422,8 @@
             // initialize the container
             this.initContainer();
 
-            //installFilteredMouseMove(this.results);
-            this.dropdown.delegate(resultsSelector, "mouseover", this.bind(this.highlightUnderEvent));
+            installFilteredMouseMove(this.results);
+            this.dropdown.delegate(resultsSelector, "mousemove-filtered", this.bind(this.highlightUnderEvent));
 
             installDebouncedScroll(80, this.results);
             this.dropdown.delegate(resultsSelector, "scroll-debounced", this.bind(this.loadMoreIfNeeded));