Log the fragment back stack status with each change for debugging purposes.

MainActivity.kt

// Adapted from: https://stackoverflow.com/a/67267584/3539594
private fun listenNavigationChanges() {
    val navHost = supportFragmentManager.findFragmentById(R.id.container) as NavHostFragment
    val navController = navHost.navController

    navController.addOnDestinationChangedListener { _, destination, _ ->

        val breadcrumb = navController
            .backQueue
            .map {
                it.destination
            }
            .filterNot {
                it is NavGraph
            }
            .joinToString(" > ") {
                it.displayName.split('/')[1]
            }

        println(breadcrumb)
    }
}