Use height of items to compute heightDelta

Author: balvig

src/jquery.autocomplete.js

@@ -851,16 +851,17 @@
 
         adjustScroll: function (index) {
             var that = this,
-                activeItem = that.activate(index),
-                offsetTop,
-                upperBound,
-                lowerBound,
-                heightDelta = 25;
+                activeItem = that.activate(index)
 
             if (!activeItem) {
                 return;
             }
 
+            var offsetTop,
+                upperBound,
+                lowerBound,
+                heightDelta = $(activeItem).outerHeight();
+
             offsetTop = activeItem.offsetTop;
             upperBound = $(that.suggestionsContainer).scrollTop();
             lowerBound = upperBound + that.options.maxHeight - heightDelta;