html.document.removeEventListener is not running properly

[chentianxin]

No matter how I trigger the delete event, it's useless

void initState() {
  super.initState();
  html.document.addEventListener('visibilitychange', _webVisibilitychange);
}

void dispose() {
  super.dispose();
  html.document.removeEventListener('visibilitychange', _webVisibilitychange);
}

void _webVisibilitychange(html.Event event) {
  print(event);
  print(mounted);
}

[terrier989]

Thanks for the report! In browser, it will use dart:html and behave correctly. Elsewhere it's not expected to work.