message: Check the origin of a message when dispatching keyboard events.
diff: @@ -162,8 +162,10 @@ export class Viewer {
  // we have to dispatch keyboard events in the parent window.
  // See https://github.com/microsoft/vscode/issues/65452#issuecomment-586036474
  window.addEventListener('message', (e) => {
  + if (e.origin === 'http://localhost:${this.extension.server.port}') {
  window.dispatchEvent(new KeyboardEvent('keydown', e.data));
  - }, false);
  + }
  + });
  </script>
  </body></html>
  `
  