Fix freezing tabs on Safari (#1770)

Co-authored-by: Sébastien Levert <[email protected]>

Author: musale

.storybook/addons/codeEditorAddon/codeAddon.js

@@ -198,7 +198,7 @@ export const withCodeEditor = makeDecorator({
         doc.open();
         doc.write(docContent);
         doc.close();
-      });
+      }, {once:true});
 
       storyElement.className = 'story-mgt-preview';
       storyElement.setAttribute('title', 'preview');

.storybook/addons/codeEditorAddon/editor.js

@@ -177,6 +177,7 @@ export class EditorElement extends LitElement {
   }
 
   disconnectedCallback() {
+    this.editor.removeEventListener('fileUpdated');
     window.removeEventListener('resize', this.handleResize);
   }
 
@@ -193,7 +194,7 @@ export class EditorElement extends LitElement {
       this.editor.restoreViewState(this.currentEditorState.state);
     }
 
-    if(this.autoFormat) {
+    if (this.autoFormat) {
       this.editor.getAction('editor.action.formatDocument').run();
     }
   }