From 5444e177271ab31c70e8a4b369fd18e0bf7edd00 Mon Sep 17 00:00:00 2001
From: Santhosh Thottingal <santhosh.thottingal@gmail.com>
Date: Fri, 1 Nov 2013 11:08:15 +0530
Subject: [PATCH] Avoid 'recalculate style' by conditionally change classes
 while scrolling

Change-Id: I71b42f9f974a1367700283ad55013e9e6a036827
---
 src/jquery.uls.lcd.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/jquery.uls.lcd.js b/src/jquery.uls.lcd.js
index 25178c1..049b50d 100644
--- a/src/jquery.uls.lcd.js
+++ b/src/jquery.uls.lcd.js
@@ -301,9 +301,12 @@
 					}
 				} );
 
+				// highlight the region visible while scrolling in the map.
 				inview = $.uls.data.regiongroups[inviewRegion];
-				$( '.regionselector' ).removeClass( 'active' );
-				$( '#uls-region-' + inview ).addClass( 'active' );
+				if ( !$( '#uls-region-' + inview ).hasClass( 'active' ) ) {
+					$( '.regionselector' ).removeClass( 'active' );
+					$( '#uls-region-' + inview ).addClass( 'active' );
+				}
 			} );
 		}
 	};