Enable system tray menu items after trigger during app start up

[tinomatic]

I set my system tray app menu with all menu items disabled at start up (as described in #2200 - Thanks @woubuc).

During execution of .setup the app checks to see if a JWT token was previously obtained and stored i.e. if the user registered previously. If yes, I need to re-enable one or more of the system tray menu items. I'm trying to do it like this:

let th = app.handle().tray_handle();
th.get_item(&"open_action".to_string()).set_enabled(true);

The problem is, at that point in the app's execution (.setup) the tray has not initialised, so I get the following runtime error:

thread 'main' panicked at 'tray not configured; use the Builder#system_tray API first.'

So the question is, how do I access the tray items to set them enabled? Can I move my check (for the JWT) out of .setup and use tray_handle().get_item(...) later in the app startup process (where?) or is there another method of access the tray from .setup?

Some similar example code:

let menu_item_1 = CustomMenuItem::new("open_action".to_string(), "Open...").disabled();
let menu_item_2 = CustomMenuItem::new("close_action".to_string(), "Close").disabled();

let tray_menu = SystemTrayMenu::new()
    .add_item(menu_item_1)
    .add_item(menu_item_2)

tauri::Builder::default()
  .system_tray(SystemTray::new().with_menu(tray_menu))
  .on_system_tray_event(|app, event| match event { ... })
  .setup(|app| {

    ...
    do stuff
    ...

    if get_JWT() {
      let th = app.handle().tray_handle();
      th.get_item(&"open_action".to_string()).set_enabled(true);
    }

    Ok(())
  })
  .run(...)
  .expect(...);