From 582a8932d3933517b36c9b1d499f9ddeba145fbf Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 13 Jul 2016 12:36:06 -0400
Subject: [PATCH] really fix out-in mode

---
 src/platforms/web/runtime/components/transition.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/platforms/web/runtime/components/transition.js b/src/platforms/web/runtime/components/transition.js
index 6f3b6031..6d746ace 100644
--- a/src/platforms/web/runtime/components/transition.js
+++ b/src/platforms/web/runtime/components/transition.js
@@ -60,15 +60,18 @@ export default {
     const oldChild = getRealChild(oldRawChild)
     if (mode && oldChild && oldChild.data && oldChild.key !== child.key) {
       if (mode === 'out-in') {
-        // return old node
-        // and queue an update when the leave finishes
-        if (!oldChild.elm._leaveCb && oldRawChild.data.transition) {
+        if (
+          !oldChild.elm._leaveCb && // not already leaving
+          oldChild.data.transition // not already left
+        ) {
           leave(oldChild, () => {
-            oldRawChild.data.transition = null
+            // mark left & avoid triggering leave transition again
+            oldChild.data.transition = null
             this.$forceUpdate()
           })
         }
-        if (oldRawChild.data.transition) {
+        // return old node if not left yet
+        if (oldChild.data.transition) {
           return oldRawChild
         }
       } else if (mode === 'in-out') {