Mark fields readonly

src/vs/editor/contrib/codeAction/codeActionWidget.ts

@@ -16,9 +16,9 @@ import { IContextMenuService } from 'vs/platform/contextview/browser/contextView
 export class CodeActionContextMenu {
 
 	private _visible: boolean;
-	private _onDidExecuteCodeAction = new Emitter<void>();
 
-	readonly onDidExecuteCodeAction: Event<void> = this._onDidExecuteCodeAction.event;
+	private readonly _onDidExecuteCodeAction = new Emitter<void>();
+	public readonly onDidExecuteCodeAction: Event<void> = this._onDidExecuteCodeAction.event;
 
 	constructor(
 		private readonly _editor: ICodeEditor,