From 558815c24e0bade16c2cc1a1973bd3b9e7d91e07 Mon Sep 17 00:00:00 2001
From: AidenCao <hashplus@outlook.com>
Date: Mon, 6 Feb 2017 15:50:14 +0800
Subject: [PATCH 1/4] fix addClass util bug
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

`<transition-group move-class=“ value with leading or trailing whitespace ” />`
---
 src/platforms/web/runtime/class-util.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/platforms/web/runtime/class-util.js b/src/platforms/web/runtime/class-util.js
index 80d866d73a8..4319de79fbc 100644
--- a/src/platforms/web/runtime/class-util.js
+++ b/src/platforms/web/runtime/class-util.js
@@ -12,6 +12,7 @@ export function addClass (el: Element, cls: ?string) {
 
   /* istanbul ignore else */
   if (el.classList) {
+    cls = cls.trim()
     if (cls.indexOf(' ') > -1) {
       cls.split(/\s+/).forEach(c => el.classList.add(c))
     } else {

From ababf5fd6aacf196b439756401b7fda05304f8cd Mon Sep 17 00:00:00 2001
From: AidenCao <hashplus@outlook.com>
Date: Mon, 6 Feb 2017 16:02:08 +0800
Subject: [PATCH 2/4] fix addClass util bug
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

`<transition-group move-class=“ value with leading or trailing whitespace ” />`
---
 src/platforms/web/runtime/class-util.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/platforms/web/runtime/class-util.js b/src/platforms/web/runtime/class-util.js
index 4319de79fbc..3e83aba4cbb 100644
--- a/src/platforms/web/runtime/class-util.js
+++ b/src/platforms/web/runtime/class-util.js
@@ -6,13 +6,12 @@
  */
 export function addClass (el: Element, cls: ?string) {
   /* istanbul ignore if */
-  if (!cls || !cls.trim()) {
+  if (!cls || !(cls = cls.trim())) {
     return
   }
 
   /* istanbul ignore else */
   if (el.classList) {
-    cls = cls.trim()
     if (cls.indexOf(' ') > -1) {
       cls.split(/\s+/).forEach(c => el.classList.add(c))
     } else {

From 61463c3c17493b9c03945bb413623c34d31b28b6 Mon Sep 17 00:00:00 2001
From: AidenCao <hashplus@outlook.com>
Date: Mon, 6 Feb 2017 16:02:08 +0800
Subject: [PATCH 3/4] fix addClass util bug
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

`<transition-group move-class=“ value with leading or trailing whitespace ” />`
---
 src/platforms/web/runtime/class-util.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/platforms/web/runtime/class-util.js b/src/platforms/web/runtime/class-util.js
index 4319de79fbc..a33449af3e0 100644
--- a/src/platforms/web/runtime/class-util.js
+++ b/src/platforms/web/runtime/class-util.js
@@ -6,13 +6,12 @@
  */
 export function addClass (el: Element, cls: ?string) {
   /* istanbul ignore if */
-  if (!cls || !cls.trim()) {
+  if (!cls || !(cls = cls.trim())) {
     return
   }
 
   /* istanbul ignore else */
   if (el.classList) {
-    cls = cls.trim()
     if (cls.indexOf(' ') > -1) {
       cls.split(/\s+/).forEach(c => el.classList.add(c))
     } else {
@@ -32,7 +31,7 @@ export function addClass (el: Element, cls: ?string) {
  */
 export function removeClass (el: Element, cls: ?string) {
   /* istanbul ignore if */
-  if (!cls || !cls.trim()) {
+  if (!cls || !(cls = cls.trim())) {
     return
   }
 

From 48f62fcb9eb2bca9b6aaae4c33a7803bde880946 Mon Sep 17 00:00:00 2001
From: AidenCao <hashplus@outlook.com>
Date: Mon, 6 Feb 2017 19:33:20 +0800
Subject: [PATCH 4/4] update test case for `addClass / removeClass` util

---
 test/unit/features/transition/transition.spec.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/unit/features/transition/transition.spec.js b/test/unit/features/transition/transition.spec.js
index 22fa39d8a3f..7d65eeacefa 100644
--- a/test/unit/features/transition/transition.spec.js
+++ b/test/unit/features/transition/transition.spec.js
@@ -73,7 +73,7 @@ if (!isIE9) {
               enter-to-class="hello-to"
               leave-class="bye"
               leave-to-class="bye-to"
-              leave-active-class="byebye active">
+              leave-active-class="byebye active more ">
               <div v-if="ok" class="test">foo</div>
             </transition>
           </div>
@@ -85,9 +85,9 @@ if (!isIE9) {
       expect(vm.$el.innerHTML).toBe('<div class="test">foo</div>')
       vm.ok = false
       waitForUpdate(() => {
-        expect(vm.$el.children[0].className).toBe('test bye byebye active')
+        expect(vm.$el.children[0].className).toBe('test bye byebye active more')
       }).thenWaitFor(nextFrame).then(() => {
-        expect(vm.$el.children[0].className).toBe('test byebye active bye-to')
+        expect(vm.$el.children[0].className).toBe('test byebye active more bye-to')
       }).thenWaitFor(duration + buffer).then(() => {
         expect(vm.$el.children.length).toBe(0)
         vm.ok = true