From dd8e385695fd1f5eecd234edbd4e7c6acc7cd7d6 Mon Sep 17 00:00:00 2001
From: Ricardo Tomasi <ricardobeat@gmail.com>
Date: Tue, 5 Apr 2016 19:19:44 +0200
Subject: [PATCH] addClassesToSVGElement: avoid repeated classnames

---
 plugins/addClassesToSVGElement.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/plugins/addClassesToSVGElement.js b/plugins/addClassesToSVGElement.js
index 3afabfb37..3f9596aa4 100644
--- a/plugins/addClassesToSVGElement.js
+++ b/plugins/addClassesToSVGElement.js
@@ -42,11 +42,13 @@ exports.fn = function(data, params) {
 
     if (svg.isElem('svg')) {
         if (svg.hasAttr('class')) {
-            svg.attr('class').value =
-                svg.attr('class').value
-                    .split(' ')
-                    .concat(classNames)
-                    .join(' ');
+            var classes = svg.attr('class').value.split(' ');
+            classNames.forEach(function(className){
+                if (classes.indexOf(className) < 0) {
+                    classes.push(className);
+                }
+            });
+            svg.attr('class').value = classes.join(' ');
         } else {
             svg.addAttr({
                 name: 'class',