Fragment multiple tabs without remove or replace

MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var swipeFragment: SwipeFragment
    private lateinit var favoritesFragment: FavoritesFragment
    private lateinit var newsFragment: NewsFragment

    private val fragments: Array<out Fragment> get() = arrayOf(swipeFragment, favoritesFragment, newsFragment)

    private fun selectFragment(selectedFragment: Fragment) {
        var transaction = supportFragmentManager.beginTransaction()
        fragments.forEachIndexed { index, fragment ->
            if(selectedFragment == fragment) {
                transaction = transaction.attach(fragment)
                selectedIndex = index
            } else {
                transaction = transaction.detach(fragment)
            }
        }
        transaction.commit()
    }

    private var selectedIndex = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (savedInstanceState == null) {
            swipeFragment = SwipeFragment()
            favoritesFragment = FavoritesFragment()
            newsFragment = NewsFragment()

            supportFragmentManager.beginTransaction()
                .add(R.id.fragment_on_display, swipeFragment, "swipe")
                .add(R.id.fragment_on_display, favoritesFragment, "favorites")
                .add(R.id.fragment_on_display, newsFragment, "news")
                .commitNow()
        } else {
            selectedIndex = savedInstanceState.getInt("selectedIndex", 0)

            swipeFragment = supportFragmentManager.findFragmentByTag("swipe") as SwipeFragment
            favoritesFragment = supportFragmentManager.findFragmentByTag("favorites") as FavoritesFragment
            newsFragment = supportFragmentManager.findFragmentByTag("news") as NewsFragment
        }

        val selectedFragment = fragments[selectedIndex]

        selectFragment(selectedFragment)

        val homeButton = findViewById<ImageButton>(R.id.home_button)
        homeButton.setOnClickListener{
            selectFragment(swipeFragment)
        }

        val listButton = findViewById<ImageButton>(R.id.list_button)
        listButton.setOnClickListener {
            selectFragment(favoritesFragment)
        }

        val newsButton = findViewById<ImageButton>(R.id.news_button)
        newsButton.setOnClickListener {
            selectFragment(newsFragment)
        }
    }

    override fun onSaveInstanceState(bundle: Bundle) {
        super.onSaveInstanceState(bundle)
        bundle.putInt("selectedIndex", selectedIndex)
    }
}