Fix for the ConcurrentModificationException caused by navigating back from the QR code screen

import app.k9mail.feature.onboarding.welcome.ui.WelcomeScreen

import app.k9mail.feature.settings.import.ui.SettingsImportAction

import app.k9mail.feature.settings.import.ui.SettingsImportScreen

import kotlinx.coroutines.CoroutineScope

import kotlinx.coroutines.Dispatchers

import kotlinx.coroutines.launch

import org.koin.compose.koinInject

private const val NESTED_NAVIGATION_ROUTE_WELCOME = "welcome"

    onFinish: (String?) -> Unit,

    hasRuntimePermissions: HasRuntimePermissions = koinInject(),

    onboardingMigrationManager: OnboardingMigrationManager = koinInject(),

    coroutineScope: CoroutineScope = CoroutineScope(Dispatchers.Main),

) {

    val navController = rememberNavController()

    var accountUuid by rememberSaveable { mutableStateOf<String?>(null) }

            SettingsImportScreen(

                action = SettingsImportAction.ScanQrCode,

                onImportSuccess = ::onImportSuccess,

                onBack = { navController.popBackStack() },

                onBack = {

                    // Fix for the navigation issue causing a ConcurrentModificationException when navigating back

                    // from the QR code scanner that is nested in the settings import fragment.

                    // There is a race condition when the fragment result listener is triggered and the

                    // fragment lifecycle is handled within the composable.

                    // This is a workaround to postpone immediate interaction with the nav controller,

                    // until we have a better solution.

                    coroutineScope.launch {

                        navController.popBackStack()

                    }

                },

            )

        }