fix: clear backstack on critical update navigation

Author: jvsena42

app/src/main/java/to/bitkit/ui/ContentView.kt

@@ -127,6 +127,7 @@ fun ContentView(
         appViewModel.mainScreenEffect.collect {
             when (it) {
                 is MainScreenEffect.Navigate -> navigator.navigate(it.route)
+                is MainScreenEffect.NavigateAndClearBackstack -> navigator.navigateAndClearBackstack(it.route)
                 is MainScreenEffect.ProcessClipboardAutoRead -> {
                     if (!navigator.isAtHome()) {
                         navigator.navigateToHome()

app/src/main/java/to/bitkit/ui/nav/Navigator.kt

@@ -50,6 +50,11 @@ class Navigator(@PublishedApi internal val backStack: NavBackStack<NavKey>) {
 
     fun isAtHome(): Boolean = backStack.lastOrNull() is Routes.Home
 
+    fun navigateAndClearBackstack(route: Routes) {
+        backStack.clear()
+        backStack.add(route)
+    }
+
     fun shouldShowTabBar(): Boolean = when (backStack.lastOrNull()) {
         is Routes.Home, is Routes.Savings, is Routes.Spending, is Routes.Activity.All -> true
         else -> false

app/src/main/java/to/bitkit/viewmodels/AppViewModel.kt

@@ -1710,7 +1710,7 @@ class AppViewModel @Inject constructor(
             if (androidReleaseInfo.buildNumber <= currentBuildNumber) return@withContext
 
             if (androidReleaseInfo.isCritical) {
-                mainScreenEffect(MainScreenEffect.Navigate(Routes.CriticalUpdate))
+                mainScreenEffect(MainScreenEffect.NavigateAndClearBackstack(Routes.CriticalUpdate))
             }
         }.onFailure { e ->
             Logger.warn("Failure fetching new releases", e = e, context = TAG)
@@ -1784,6 +1784,7 @@ sealed class SendEffect {
 
 sealed class MainScreenEffect {
     data class Navigate(val route: Routes) : MainScreenEffect()
+    data class NavigateAndClearBackstack(val route: Routes) : MainScreenEffect()
     data object WipeWallet : MainScreenEffect()
     data class ProcessClipboardAutoRead(val data: String) : MainScreenEffect()
 }