From 6557017d4e8b9e51fb86a0017b5fd37310e01655 Mon Sep 17 00:00:00 2001
From: linonetwo <linonetwo012@gmail.com>
Date: Thu, 3 Oct 2024 23:14:11 +0800
Subject: [PATCH] fix: addClass may cause class pad with space, cause test to
 fail

---
 core/modules/utils/dom/dom.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/modules/utils/dom/dom.js b/core/modules/utils/dom/dom.js
index 0b71e128c..2037fd37b 100644
--- a/core/modules/utils/dom/dom.js
+++ b/core/modules/utils/dom/dom.js
@@ -57,7 +57,8 @@ exports.hasClass = function(el,className) {
 };
 
 exports.addClass = function(el,className) {
-	var c = (el.getAttribute("class") || "").split(" ");
+	var classAttr = el.getAttribute("class") || "";
+	var c = classAttr.trim() ? classAttr.split(" ") : [];
 	if(c.indexOf(className) === -1) {
 		c.push(className);
 		el.setAttribute("class",c.join(" "));