From 1a20f40c5463bc09ffd52a264773501196accdbd Mon Sep 17 00:00:00 2001
From: Artur Arseniev <artur.catch@hotmail.it>
Date: Wed, 28 Apr 2021 01:27:34 +0200
Subject: [PATCH] Prevent breaking the changes counter. Fixes #3412

---
 src/editor/model/Editor.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/editor/model/Editor.js b/src/editor/model/Editor.js
index bd2d650ce..f97ec990d 100644
--- a/src/editor/model/Editor.js
+++ b/src/editor/model/Editor.js
@@ -267,7 +267,9 @@ export default Backbone.Model.extend({
 
     timedInterval && clearTimeout(timedInterval);
     timedInterval = setTimeout(() => {
-      this.set('changesCount', this.get('changesCount') + 1, opt);
+      const curr = this.get('changesCount') || 0;
+      const { unset, ...opts } = opt;
+      this.set('changesCount', curr + 1, opts);
     }, 0);
   },