message: Rendered left bar only if there's content
  Either child bar buttons or a 'native' back button
diff: @@ -85,7 +85,7 @@ jest.mock('navigation-react-native', () => {
  const LeftBar = ({children, ...props}) => {
  const {stateNavigator} = React.useContext(NavigationReact.NavigationContext);
  - return (
  + return (children || stateNavigator.canNavigateBack(1)) && (
  <ReactNative.View accessibilityRole="menubar" {...props}>
  {stateNavigator.canNavigateBack(1) && (
  <ReactNative.Pressable accessibilityRole="menuitem">
  