Add destroy method to SelectorManager module

src/editor/model/Editor.js

@@ -766,7 +766,8 @@ export default Backbone.Model.extend({
       DeviceManager,
       I18n,
       Modal,
-      Parser
+      Parser,
+      SelectorManager
     } = this.attributes;
     this.stopDefault();
     DomComponents.destroy();
@@ -785,6 +786,7 @@ export default Backbone.Model.extend({
     I18n.destroy();
     Modal.destroy();
     Parser.destroy();
+    SelectorManager.destroy();
     this.view.remove();
     this.stopListening();
     this.clear({ silent: true });

src/selector_manager/index.js

@@ -312,6 +312,15 @@ export default config => {
         });
         return this.selectorTags.render().el;
       } else return this.selectorTags.render().el;
+    },
+
+    destroy() {
+      selectors.reset();
+      selectors.stopListening();
+      this.selectorTags.remove();
+      [c, selectors].forEach(i => (i = {}));
+      this.em = {};
+      this.selectorTags = {};
     }
   };
 };