Simplify setup

Author: zsmb13

shared/src/commonMain/kotlin/org/jetbrains/kotlinconf/navigation/BackStack.kt

@@ -1,15 +1,13 @@
 package org.jetbrains.kotlinconf.navigation
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.saveable.rememberSerializable
-import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavKey
-import androidx.navigation3.runtime.serialization.NavBackStackSerializer
+import androidx.savedstate.compose.serialization.serializers.SnapshotStateListSerializer
 import kotlinx.serialization.serializer
 
 @Composable
-inline fun <reified T : NavKey> rememberNavBackStack(vararg elements: T): NavBackStack<T> {
-    return rememberSerializable(serializer = NavBackStackSerializer(serializer())) {
-        NavBackStack(*elements)
-    }
+inline fun <reified T : NavKey> rememberNavBackStack(vararg elements: T): MutableList<T> {
+    return rememberSerializable(serializer = SnapshotStateListSerializer(serializer())) { mutableStateListOf(*elements) }
 }

shared/src/commonMain/kotlin/org/jetbrains/kotlinconf/navigation/KotlinConfNavHost.kt

@@ -7,7 +7,6 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
 import androidx.navigation3.runtime.EntryProviderScope
-import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.entryProvider
 import androidx.navigation3.runtime.rememberSaveableStateHolderNavEntryDecorator
 import androidx.navigation3.scene.Scene
@@ -61,7 +60,7 @@ fun navigateToNews(newsId: String) {
 private val notificationNavRequests = Channel<Any>(capacity = 1)
 
 @Composable
-private fun NotificationHandler(backStack: NavBackStack<AppRoute>) {
+private fun NotificationHandler(backStack: MutableList<AppRoute>) {
     LaunchedEffect(Unit) {
         while (true) {
             val destination: Any = notificationNavRequests.receive()
@@ -75,7 +74,6 @@ internal fun KotlinConfNavHost(
     isOnboardingComplete: Boolean,
     popTransactionSpec: (AnimatedContentTransitionScope<Scene<Any>>.() -> ContentTransform)?,
 ) {
-    // TODO: make this saveable!
     val startDestination = if (isOnboardingComplete) MainScreen else StartPrivacyNoticeScreen
     val appBackStack = rememberNavBackStack<AppRoute>(startDestination)
 
@@ -95,7 +93,7 @@ internal fun KotlinConfNavHost(
     )
 }
 
-fun EntryProviderScope<Any>.screens(backStack: NavBackStack<AppRoute>) {
+fun EntryProviderScope<Any>.screens(backStack: MutableList<AppRoute>) {
     startScreens(backStack) // TODO inline these later
 
     entry<MainScreen> {
@@ -237,7 +235,7 @@ fun EntryProviderScope<Any>.screens(backStack: NavBackStack<AppRoute>) {
     }
 }
 
-fun EntryProviderScope<Any>.startScreens(backStack: NavBackStack<AppRoute>) {
+fun EntryProviderScope<Any>.startScreens(backStack: MutableList<AppRoute>) {
     entry<StartPrivacyNoticeScreen> {
         val skipNotifications = LocalFlags.current.supportsNotifications.not()
         AppPrivacyNoticePrompt(

shared/src/commonMain/kotlin/org/jetbrains/kotlinconf/screens/MainScreen.kt

@@ -25,7 +25,6 @@ import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.navigation3.rememberViewModelStoreNavEntryDecorator
-import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.entryProvider
 import androidx.navigation3.runtime.rememberSaveableStateHolderNavEntryDecorator
 import androidx.navigation3.ui.NavDisplay
@@ -85,7 +84,6 @@ fun MainScreen(
             .background(color = KotlinConfTheme.colors.mainBackground)
             .windowInsetsPadding(WindowInsets.safeDrawing)
     ) {
-        // TODO: make this saveable!
         val localBackStack = rememberNavBackStack<MainRoute>(ScheduleScreen)
 
         NavDisplay(
@@ -162,7 +160,7 @@ private fun isKeyboardOpen(): Boolean {
 }
 
 @Composable
-private fun BottomNavigation(localBackStack: NavBackStack<MainRoute>) {
+private fun BottomNavigation(localBackStack: MutableList<MainRoute>) {
     val bottomNavDestinations: List<MainNavDestination<MainRoute>> =
         listOf(
             MainNavDestination(