From 5017f641b09626e7f3ed9cb110e541acca32b7a5 Mon Sep 17 00:00:00 2001
From: Artur Arseniev <artur.catch@hotmail.it>
Date: Sat, 14 Nov 2020 18:01:31 +0100
Subject: [PATCH] Add destroy method to UndoManager module

---
 src/editor/model/Editor.js | 2 +-
 src/undo_manager/index.js  | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/editor/model/Editor.js b/src/editor/model/Editor.js
index e68a85cd8..544e8de92 100644
--- a/src/editor/model/Editor.js
+++ b/src/editor/model/Editor.js
@@ -775,7 +775,7 @@ export default Backbone.Model.extend({
     this.stopDefault();
     DomComponents.destroy();
     CssComposer.destroy();
-    UndoManager.clear().removeAll();
+    UndoManager.destroy();
     Panels.destroy();
     Canvas.destroy();
     Keymaps.destroy();
diff --git a/src/undo_manager/index.js b/src/undo_manager/index.js
index 2b8f29015..429fbdf52 100644
--- a/src/undo_manager/index.js
+++ b/src/undo_manager/index.js
@@ -293,6 +293,12 @@ export default () => {
 
     getInstance() {
       return um;
+    },
+
+    destroy() {
+      this.clear().removeAll();
+      [em, um, config, beforeCache].forEach(i => (i = {}));
+      this.em = {};
     }
   };
 };