onReady method
override
    Called 1 frame after onInit(). It is the perfect place to enter navigation events, like snackbar, dialogs, or a new route, or async request.
Implementation
@override
void onReady() {
  listController.addListener(_listControllerListener);
  listController.sliverController.stickyIndex.addListener(_updateSticky);
  AudioUtils.ensureInitialized();
  _fetchChat();
  if (!PlatformUtils.isMobile) {
    send.field.focus.requestFocus();
  }
  super.onReady();
}