Function map_gui::tools::city_picker::chose_city

fn chose_city<A: AppLike + 'static>(
    ctx: &mut EventCtx<'_>, 
    app: &mut A, 
    name: MapName, 
    on_load: &mut Option<Box<dyn FnOnce(&mut EventCtx<'_>, &mut A) -> Transition<A>>>
) -> Transition<A>