From: Evan You <yyx990803@gmail.com>
Date: Fri, 26 Jun 2020 22:05:53 +0000 (-0400)
Subject: fix(runtime-core): handle patch flag de-op from cloned vnode
X-Git-Tag: v3.0.0-beta.16~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0dd5cde861735e80cfe21537380e52789cc865f8;p=thirdparty%2Fvuejs%2Fcore.git

fix(runtime-core): handle patch flag de-op from cloned vnode

close #1426
---

diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index edc00d1750..4dfc2ab663 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -780,7 +780,10 @@ function baseCreateRenderer(
   ) => {
     const el = (n2.el = n1.el!)
     let { patchFlag, dynamicChildren, dirs } = n2
-    const oldProps = (n1 && n1.props) || EMPTY_OBJ
+    // #1426 take the old vnode's patch flag into account since user may clone a
+    // compiler-generated vnode, which de-opts to FULL_PROPS
+    patchFlag |= n1.patchFlag & PatchFlags.FULL_PROPS
+    const oldProps = n1.props || EMPTY_OBJ
     const newProps = n2.props || EMPTY_OBJ
     let vnodeHook: VNodeHook | undefined | null