Sub items not visible in the side bar when rail is true

[frederic-favier]

I was playing around this template and I tried to add a subitem in the menu. In sidebarItem.ts, I just moved the "register" item into the "login" children):

  ...
  {
    title: 'Login',
    icon: LoginOutlined,
    to: '/login1',
    children: [
      {
        title: 'Register',
        icon: ProfileOutlined,
        to: '/register'
      }
    ]
  },
  ...

• When the side bar is expanded and rail = false, the subitem is displayed properly (but it could use a visual hint when the side bar is collapsed).
• When the side bar is expanded and rail = true, the subitem is not visible.

Does the child need more props ?