pop off all fragments after the specified fragment, including the specified fragment

BackStackActivity.kt

private fun popToFragmentBeforeKnownFragment(fragment: Fragment) {
        if (!lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED))
            return
        val isPopped = supportFragmentManager.popBackStackImmediate(fragment::class.simpleName,
                FragmentManager.POP_BACK_STACK_INCLUSIVE)
        if (!isPopped)
            throw UnsupportedOperationException("Specified fragment does not exist in backstack")
    }