From ef4ae7dd815c9059c23a8556d44451a0d30f46d3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=94=90=E9=81=93=E8=BF=9C?=
 <tangdaoyuan@MacBook-Pro-7.local>
Date: Thu, 26 Mar 2020 21:29:45 +0800
Subject: [PATCH] fix(patch.js): fix functional component scope attribute
 update

fix functional component update scope attribute when patch use same node

fix #11171
---
 src/core/vdom/patch.js                        |  3 +++
 .../modules/vdom/patch/edge-cases.spec.js     | 22 +++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/src/core/vdom/patch.js b/src/core/vdom/patch.js
index 2052df913b3..44afc8c4b15 100644
--- a/src/core/vdom/patch.js
+++ b/src/core/vdom/patch.js
@@ -547,6 +547,9 @@ export function createPatchFunction (backend) {
 
     const oldCh = oldVnode.children
     const ch = vnode.children
+    if (isDef(vnode.fnScopeId)) {
+      setScope(vnode)
+    }
     if (isDef(data) && isPatchable(vnode)) {
       for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode)
       if (isDef(i = data.hook) && isDef(i = i.update)) i(oldVnode, vnode)
diff --git a/test/unit/modules/vdom/patch/edge-cases.spec.js b/test/unit/modules/vdom/patch/edge-cases.spec.js
index a7f7ba38932..95296b7120c 100644
--- a/test/unit/modules/vdom/patch/edge-cases.spec.js
+++ b/test/unit/modules/vdom/patch/edge-cases.spec.js
@@ -1,4 +1,5 @@
 import Vue from 'vue'
+import { patch } from 'web/runtime/patch'
 
 describe('vdom patch: edge cases', () => {
   // exposed by #3406
@@ -432,4 +433,25 @@ describe('vdom patch: edge cases', () => {
       expect(vm.$el.textContent).not.toMatch('Infinity')
     }).then(done)
   })
+
+  // #11171
+  it("should replace functional element scope attribute", () => {
+    const vm = new Vue({
+      components: {
+        foo: {
+          functional: true,
+          _scopeId: "foo",
+          render (h) {
+            return h('div')
+          }
+        }
+      }
+    })
+    const h = vm.$createElement
+    const vnode = h('foo')
+    const oldVnode = h("div")
+    patch(null, oldVnode)
+    let elm = patch(oldVnode, vnode)
+    expect(elm.hasAttribute("foo")).toBe(true)
+  })
 })