From cb67eb535c0f695941235f402cc4b405f70bc022 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jo=CC=88rn=20Zaefferer?= <joern.zaefferer@gmail.com>
Date: Fri, 13 Apr 2012 15:12:37 +0200
Subject: [PATCH] Position: Cache the scrollbarWidth calculation result

---
 ui/jquery.ui.position.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ui/jquery.ui.position.js b/ui/jquery.ui.position.js
index 9e7407d7b..31da2237b 100644
--- a/ui/jquery.ui.position.js
+++ b/ui/jquery.ui.position.js
@@ -16,10 +16,14 @@ var rhorizontal = /left|center|right/,
 	roffset = /[\+\-]\d+%?/,
 	rposition = /^\w+/,
 	rpercent = /%$/,
-	_position = $.fn.position;
+	_position = $.fn.position,
+	cachedScrollbarWidth;
 
 $.position = {
 	scrollbarWidth: function() {
+		if ( cachedScrollbarWidth !== undefined ) {
+			return cachedScrollbarWidth;
+		}
 		var w1, w2,
 			div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
 			innerDiv = div.children()[0];
@@ -36,7 +40,7 @@ $.position = {
 
 		div.remove();
 
-		return w1 - w2;
+		return (cachedScrollbarWidth = w1 - w2);
 	},
 	getScrollInfo: function( within ) {
 		var overflowX = within.isWindow ? "" : within.element.css( "overflow-x" ),
-- 
2.39.5