From a7b457cb529069992dd58af8aa9bea87f0cd7c4c Mon Sep 17 00:00:00 2001
From: Artur Arseniev <artur.catch@hotmail.it>
Date: Sun, 10 Jun 2018 00:59:41 +0200
Subject: [PATCH] Avoid content to be deleted from defaults in toJSON This
 prevents issues with UndoManager

---
 src/dom_components/model/Component.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dom_components/model/Component.js b/src/dom_components/model/Component.js
index ef63c5804..120db697f 100644
--- a/src/dom_components/model/Component.js
+++ b/src/dom_components/model/Component.js
@@ -744,7 +744,7 @@ const Component = Backbone.Model.extend(Styleable).extend(
         const defaults = this.defaults;
 
         forEach(defaults, (value, key) => {
-          if (key !== 'type' && obj[key] === value) {
+          if (['type', 'content'].indexOf(key) === -1 && obj[key] === value) {
             delete obj[key];
           }
         });