From ad93fa42fc8c32d121c0121083d2f0bb40672737 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 2 Sep 2020 12:15:36 -0400
Subject: [PATCH] fix(runtime-core): openBlock() should not be tracked when
 block tracking is disabled

---
 packages/runtime-core/__tests__/vnode.spec.ts | 14 +++++++++++++-
 packages/runtime-core/src/vnode.ts            |  2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/__tests__/vnode.spec.ts b/packages/runtime-core/__tests__/vnode.spec.ts
index 2ee1872a..0a08d4f3 100644
--- a/packages/runtime-core/__tests__/vnode.spec.ts
+++ b/packages/runtime-core/__tests__/vnode.spec.ts
@@ -12,7 +12,7 @@ import {
 } from '../src/vnode'
 import { Data } from '../src/component'
 import { ShapeFlags, PatchFlags } from '@vue/shared'
-import { h, reactive, isReactive } from '../src'
+import { h, reactive, isReactive, setBlockTracking } from '../src'
 import { createApp, nodeOps, serializeInner } from '@vue/runtime-test'
 import { setCurrentRenderingInstance } from '../src/componentRenderUtils'
 
@@ -535,6 +535,18 @@ describe('vnode', () => {
       expect(vnode.dynamicChildren).toStrictEqual([vnode1])
       expect(vnode1.dynamicChildren).toStrictEqual([vnode2])
     })
+
+    test('should not track openBlock() when tracking is disabled', () => {
+      let vnode1
+      const vnode = (openBlock(),
+      createBlock('div', null, [
+        setBlockTracking(-1),
+        (vnode1 = (openBlock(), createBlock('div'))),
+        setBlockTracking(1),
+        vnode1
+      ]))
+      expect(vnode.dynamicChildren).toStrictEqual([])
+    })
   })
 
   describe('transformVNodeArgs', () => {
diff --git a/packages/runtime-core/src/vnode.ts b/packages/runtime-core/src/vnode.ts
index de329ff9..0c468fd0 100644
--- a/packages/runtime-core/src/vnode.ts
+++ b/packages/runtime-core/src/vnode.ts
@@ -235,7 +235,7 @@ export function createBlock(
   closeBlock()
   // a block is always going to be patched, so track it as a child of its
   // parent block
-  if (currentBlock) {
+  if (shouldTrack > 0 && currentBlock) {
     currentBlock.push(vnode)
   }
   return vnode