While implementing persistent bottom bar, previous route need to be restored when a button in the bottom bar was clicked.
When a button in the bottom bar is clicked, its current route path (/a/b/c) is saved and previously saved route is restored according to the button click.
Conceptually user will think each button as a workspace and its state is never get lost (including back stack). User can safely switch from one workspace to another.
How to get current route path in Flutter, when the routing is rewinding to root?