From e3f9466d8b51e473d2ffa9040985952d03d1c3f7 Mon Sep 17 00:00:00 2001
From: Vasyl Zuzyak <ZuBB@users.noreply.github.com>
Date: Sun, 14 Feb 2016 14:03:49 -0500
Subject: [PATCH] Reuse result of previous calcualtion

This closes https://github.com/select2/select2/pull/4155.
---
 src/js/select2/results.js | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/js/select2/results.js b/src/js/select2/results.js
index 1e49263c..e55cc879 100644
--- a/src/js/select2/results.js
+++ b/src/js/select2/results.js
@@ -397,11 +397,7 @@ define([
       this.$results.on('mousewheel', function (e) {
         var top = self.$results.scrollTop();
 
-        var bottom = (
-          self.$results.get(0).scrollHeight -
-          self.$results.scrollTop() +
-          e.deltaY
-        );
+        var bottom = self.$results.get(0).scrollHeight - top + e.deltaY;
 
         var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
         var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();