Add destroy method to BlockManagar

src/block_manager/index.js

@@ -255,6 +255,16 @@ export default () => {
       }
 
       return this.getContainer();
+    },
+
+    destroy() {
+      blocks.reset();
+      blocks.stopListening();
+      blocksVisible.reset();
+      categories.reset();
+      blocksView.remove();
+      [blocks, blocksVisible, categories, blocksView].forEach(i => (i = null));
+      c = {};
     }
   };
 };

src/editor/model/Editor.js

@@ -759,7 +759,8 @@ export default Backbone.Model.extend({
       Keymaps,
       RichTextEditor,
       LayerManager,
-      AssetManager
+      AssetManager,
+      BlockManager
     } = this.attributes;
     this.stopDefault();
     DomComponents.clear();
@@ -771,6 +772,7 @@ export default Backbone.Model.extend({
     RichTextEditor.destroy();
     LayerManager.destroy();
     AssetManager.destroy();
+    BlockManager.destroy();
     this.view.remove();
     this.stopListening();
     this.clear({ silent: true });