From e7fdfcb3aca45809b4e103fc920db048e56e4648 Mon Sep 17 00:00:00 2001
From: Yanzhen Yu <yanzhen@smartx.com>
Date: Fri, 8 Jan 2021 14:03:44 +0800
Subject: [PATCH] fix #452 check isBlocked on add mutation's target

---
 src/record/mutation.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/record/mutation.ts b/src/record/mutation.ts
index f0ef9cc2..6f8be15d 100644
--- a/src/record/mutation.ts
+++ b/src/record/mutation.ts
@@ -436,6 +436,9 @@ export default class MutationBuffer {
     if (isBlocked(n, this.blockClass)) {
       return;
     }
+    if (target && isBlocked(target, this.blockClass)) {
+      return;
+    }
     if (isINode(n)) {
       if (isIgnored(n)) {
         return;