SuspendingFragmentAwait.kt

suspend fun <F : Fragment> FragmentManager.awaitFragmentById(idRes: Int) =
    suspendCancellableCoroutine<F> {
        val backStackListener = object : FragmentManager.OnBackStackChangedListener {
            override fun onBackStackChanged() {
                val f = findFragmentById(idRes) as F?
                if (f != null) {
                    removeOnBackStackChangedListener(this)
                    it.resume(f)
                }
            }
        }
        addOnBackStackChangedListener(backStackListener)
        it.invokeOnCancellation { removeOnBackStackChangedListener(backStackListener) }
    }