refactor: move skip-slide hint to NavBackStackEntry.savedStateHandle

The prior change tracked the "no slide" intent via a mutable flag on Nav
that every navigate method had to reset. Replace it with a per-entry
hint: navBottomBar writes SKIP_SLIDE_ANIMATION_KEY=true to the new
destination's savedStateHandle, and composableFromEnd reads it off
targetState (forward) / initialState (pop).

Benefits:
- No shared mutable state; no reset bookkeeping in nav/newStack/popUpTo.
- No race between interleaved navigate calls.
- Pop animations are automatically consistent with how the entry was
  entered - backing out of a bottom-bar tab now also fades.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppNavigation.kt

@@ -234,54 +234,54 @@ fun BuildNavigation(
         composable<Route.Video> { VideoScreen(accountViewModel, nav) }
         composable<Route.Discover> { DiscoverScreen(accountViewModel, nav) }
         composableArgs<Route.Notification> { NotificationScreen(it.scrollToEventId, accountViewModel, nav) }
-        composableFromEnd<Route.Polls>(nav) { PollsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Polls> { PollsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Communities>(nav) { CommunitiesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Communities> { CommunitiesScreen(accountViewModel, nav) }
-        composableFromEnd<Route.NewCommunity>(nav) { NewCommunityScreen(accountViewModel, nav) }
+        composableFromEnd<Route.NewCommunity> { NewCommunityScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.EditCommunity>(nav) { EditCommunityScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
+        composableFromEndArgs<Route.EditCommunity> { EditCommunityScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
-        composableFromEnd<Route.Badges>(nav) { BadgesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Badges> { BadgesScreen(accountViewModel, nav) }
-        composableFromEnd<Route.ProfileBadges>(nav) { ProfileBadgesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.ProfileBadges> { ProfileBadgesScreen(accountViewModel, nav) }
         composableFromBottomArgs<Route.AwardBadge> { AwardBadgeScreen(it.kind, it.pubKeyHex, it.dTag, accountViewModel, nav) }
-        composableFromEnd<Route.Pictures>(nav) { PicturesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Pictures> { PicturesScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Products>(nav) { ProductsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Products> { ProductsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Shorts>(nav) { ShortsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Shorts> { ShortsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.PublicChats>(nav) { PublicChatsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.PublicChats> { PublicChatsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.FollowPacks>(nav) { FollowPacksScreen(accountViewModel, nav) }
+        composableFromEnd<Route.FollowPacks> { FollowPacksScreen(accountViewModel, nav) }
-        composableFromEnd<Route.LiveStreams>(nav) { LiveStreamsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.LiveStreams> { LiveStreamsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.AudioRooms>(nav) { AudioRoomsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.AudioRooms> { AudioRoomsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Longs>(nav) { LongsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Longs> { LongsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Articles>(nav) { ArticlesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Articles> { ArticlesScreen(accountViewModel, nav) }
-        composableFromEnd<Route.NewHlsVideo>(nav) { NewHlsVideoScreen(accountViewModel, nav) }
+        composableFromEnd<Route.NewHlsVideo> { NewHlsVideoScreen(accountViewModel, nav) }
         composable<Route.Chess> { ChessLobbyScreen(accountViewModel, nav) }
 
-        composableFromEnd<Route.Wallet>(nav) { WalletScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Wallet> { WalletScreen(accountViewModel, nav) }
-        composableFromEnd<Route.WalletSend>(nav) { WalletSendScreen(accountViewModel, nav) }
+        composableFromEnd<Route.WalletSend> { WalletSendScreen(accountViewModel, nav) }
-        composableFromEnd<Route.WalletReceive>(nav) { WalletReceiveScreen(accountViewModel, nav) }
+        composableFromEnd<Route.WalletReceive> { WalletReceiveScreen(accountViewModel, nav) }
-        composableFromEnd<Route.WalletTransactions>(nav) { WalletTransactionsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.WalletTransactions> { WalletTransactionsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.WalletDetail>(nav) { WalletDetailScreen(it.walletId, accountViewModel, nav) }
+        composableFromEndArgs<Route.WalletDetail> { WalletDetailScreen(it.walletId, accountViewModel, nav) }
-        composableFromEnd<Route.WalletAdd>(nav) { AddWalletScreen(accountViewModel, nav) }
+        composableFromEnd<Route.WalletAdd> { AddWalletScreen(accountViewModel, nav) }
 
-        composableFromEnd<Route.Lists>(nav) { ListOfPeopleListsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Lists> { ListOfPeopleListsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.MyPeopleListView>(nav) { PeopleListScreen(it.dTag, accountViewModel, nav) }
+        composableFromEndArgs<Route.MyPeopleListView> { PeopleListScreen(it.dTag, accountViewModel, nav) }
-        composableFromEndArgs<Route.MyFollowPackView>(nav) { FollowPackScreen(it.dTag, accountViewModel, nav) }
+        composableFromEndArgs<Route.MyFollowPackView> { FollowPackScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.PeopleListManagement> { FollowListAndPackAndUserScreen(it.userToAdd, accountViewModel, nav) }
 
         composableFromBottomArgs<Route.PeopleListMetadataEdit> { PeopleListMetadataScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.FollowPackMetadataEdit> { FollowPackMetadataScreen(it.dTag, accountViewModel, nav) }
 
-        composableFromEnd<Route.BookmarkGroups>(nav) { ListOfBookmarkGroupsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.BookmarkGroups> { ListOfBookmarkGroupsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.BookmarkGroupView>(nav) { BookmarkGroupScreen(it.dTag, it.bookmarkType, accountViewModel, nav) }
+        composableFromEndArgs<Route.BookmarkGroupView> { BookmarkGroupScreen(it.dTag, it.bookmarkType, accountViewModel, nav) }
         composableFromBottomArgs<Route.BookmarkGroupMetadataEdit> { BookmarkGroupMetadataScreen(it.dTag, accountViewModel, nav) }
 
-        composableFromEnd<Route.InterestSets>(nav) { ListOfInterestSetsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.InterestSets> { ListOfInterestSetsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.InterestSetView>(nav) { InterestSetScreen(it.dTag, accountViewModel, nav) }
+        composableFromEndArgs<Route.InterestSetView> { InterestSetScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.InterestSetMetadataEdit> { InterestSetMetadataScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.PostBookmarkManagement> { PostBookmarkListManagementScreen(it.postId, accountViewModel, nav) }
         composableFromBottomArgs<Route.ArticleBookmarkManagement> { ArticleBookmarkListManagementScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
 
-        composableFromEnd<Route.EmojiPacks>(nav) { ListOfEmojiPacksScreen(accountViewModel, nav) }
+        composableFromEnd<Route.EmojiPacks> { ListOfEmojiPacksScreen(accountViewModel, nav) }
-        composableFromEnd<Route.MyEmojiList>(nav) { MyEmojiListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.MyEmojiList> { MyEmojiListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.BrowseEmojiSets>(nav) { BrowseEmojiSetsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.BrowseEmojiSets> { BrowseEmojiSetsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.EmojiPackView>(nav) { EmojiPackScreen(it.dTag, accountViewModel, nav) }
+        composableFromEndArgs<Route.EmojiPackView> { EmojiPackScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.EmojiPackMetadataEdit> { EmojiPackMetadataScreen(it.dTag, accountViewModel, nav) }
         composableFromBottomArgs<Route.EmojiPackSelection> { EmojiPackSelectionScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
 
@@ -292,68 +292,68 @@ fun BuildNavigation(
         composableFromBottomArgs<Route.EditProfile> { NewUserMetadataScreen(nav, accountViewModel) }
         composable<Route.Search> { SearchScreen(accountViewModel, nav) }
 
-        composableFromEnd<Route.AllSettings>(nav) { AllSettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.AllSettings> { AllSettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.AccountBackup>(nav) { AccountBackupScreen(accountViewModel, nav) }
+        composableFromEnd<Route.AccountBackup> { AccountBackupScreen(accountViewModel, nav) }
-        composableFromEnd<Route.SecurityFilters>(nav) { SecurityFiltersScreen(accountViewModel, nav) }
+        composableFromEnd<Route.SecurityFilters> { SecurityFiltersScreen(accountViewModel, nav) }
-        composableFromEnd<Route.PrivacyOptions>(nav) { PrivacyOptionsScreen(nav) }
+        composableFromEnd<Route.PrivacyOptions> { PrivacyOptionsScreen(nav) }
-        composableFromEnd<Route.NamecoinSettings>(nav) { NamecoinSettingsScreen(nav) }
+        composableFromEnd<Route.NamecoinSettings> { NamecoinSettingsScreen(nav) }
-        composableFromEnd<Route.OtsSettings>(nav) { OtsSettingsScreen(nav) }
+        composableFromEnd<Route.OtsSettings> { OtsSettingsScreen(nav) }
-        composableFromEnd<Route.Bookmarks>(nav) { BookmarkListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Bookmarks> { BookmarkListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.OldBookmarks>(nav) { OldBookmarkListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.OldBookmarks> { OldBookmarkListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.PinnedNotes>(nav) { PinnedNotesScreen(accountViewModel, nav) }
+        composableFromEnd<Route.PinnedNotes> { PinnedNotesScreen(accountViewModel, nav) }
-        composableFromEnd<Route.WebBookmarks>(nav) { WebBookmarksScreen(accountViewModel, nav) }
+        composableFromEnd<Route.WebBookmarks> { WebBookmarksScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Drafts>(nav) { DraftListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Drafts> { DraftListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.Settings>(nav) { SettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.Settings> { SettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.UserSettings>(nav) { UserSettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.UserSettings> { UserSettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.ReactionsSettings>(nav) { ReactionsSettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.ReactionsSettings> { ReactionsSettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.BottomBarSettings>(nav) { BottomBarSettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.BottomBarSettings> { BottomBarSettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.CallSettings>(nav) { CallSettingsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.CallSettings> { CallSettingsScreen(accountViewModel, nav) }
-        composableFromEnd<Route.ImportFollowsSelectUser>(nav) { ImportFollowListSelectUserScreen(accountViewModel, nav) }
+        composableFromEnd<Route.ImportFollowsSelectUser> { ImportFollowListSelectUserScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.ImportFollowsPickFollows>(nav) {
+        composableFromEndArgs<Route.ImportFollowsPickFollows> {
             ImportFollowListPickFollowsScreen(it.userHex, accountViewModel, nav)
         }
 
-        composableFromEndArgs<Route.Nip47NWCSetup>(nav) { NIP47SetupScreen(accountViewModel, nav, it.nip47) }
+        composableFromEndArgs<Route.Nip47NWCSetup> { NIP47SetupScreen(accountViewModel, nav, it.nip47) }
-        composableFromEndArgs<Route.UpdateZapAmount>(nav) { UpdateZapAmountScreen(accountViewModel, nav, it.nip47) }
+        composableFromEndArgs<Route.UpdateZapAmount> { UpdateZapAmountScreen(accountViewModel, nav, it.nip47) }
-        composableFromEndArgs<Route.EditRelays>(nav) { AllRelayListScreen(accountViewModel, nav) }
+        composableFromEndArgs<Route.EditRelays> { AllRelayListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.EventSync>(nav) { EventSyncScreen(accountViewModel, nav) }
+        composableFromEnd<Route.EventSync> { EventSyncScreen(accountViewModel, nav) }
-        composableFromEnd<Route.RequestToVanish>(nav) { RequestToVanishScreen(accountViewModel, nav) }
+        composableFromEnd<Route.RequestToVanish> { RequestToVanishScreen(accountViewModel, nav) }
-        composableFromEnd<Route.VanishEvents>(nav) { VanishEventsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.VanishEvents> { VanishEventsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.EditMediaServers>(nav) { AllMediaServersScreen(accountViewModel, nav) }
+        composableFromEndArgs<Route.EditMediaServers> { AllMediaServersScreen(accountViewModel, nav) }
-        composableFromEnd<Route.EditFavoriteAlgoFeeds>(nav) { FavoriteAlgoFeedsListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.EditFavoriteAlgoFeeds> { FavoriteAlgoFeedsListScreen(accountViewModel, nav) }
-        composableFromEnd<Route.EditPaymentTargets>(nav) { PaymentTargetsScreen(accountViewModel, nav) }
+        composableFromEnd<Route.EditPaymentTargets> { PaymentTargetsScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.UpdateReactionType>(nav) { UpdateReactionTypeScreen(accountViewModel, nav) }
+        composableFromEndArgs<Route.UpdateReactionType> { UpdateReactionTypeScreen(accountViewModel, nav) }
 
-        composableFromEndArgs<Route.ContentDiscovery>(nav) { DvmContentDiscoveryScreen(it.id, accountViewModel, nav) }
+        composableFromEndArgs<Route.ContentDiscovery> { DvmContentDiscoveryScreen(it.id, accountViewModel, nav) }
-        composableFromEndArgs<Route.Profile>(nav) { ProfileScreen(it.id, accountViewModel, nav) }
+        composableFromEndArgs<Route.Profile> { ProfileScreen(it.id, accountViewModel, nav) }
-        composableFromEndArgs<Route.Note>(nav) { ThreadScreen(it.id, accountViewModel, nav) }
+        composableFromEndArgs<Route.Note> { ThreadScreen(it.id, accountViewModel, nav) }
-        composableFromEndArgs<Route.Hashtag>(nav) { HashtagScreen(it, accountViewModel, nav) }
+        composableFromEndArgs<Route.Hashtag> { HashtagScreen(it, accountViewModel, nav) }
-        composableFromEndArgs<Route.Geohash>(nav) { GeoHashScreen(it, accountViewModel, nav) }
+        composableFromEndArgs<Route.Geohash> { GeoHashScreen(it, accountViewModel, nav) }
-        composableFromEndArgs<Route.RelayFeed>(nav) { RelayFeedScreen(it, accountViewModel, nav) }
+        composableFromEndArgs<Route.RelayFeed> { RelayFeedScreen(it, accountViewModel, nav) }
-        composableFromEndArgs<Route.ChessGame>(nav) { ChessGameScreen(it.gameId, accountViewModel, nav) }
+        composableFromEndArgs<Route.ChessGame> { ChessGameScreen(it.gameId, accountViewModel, nav) }
-        composableFromEndArgs<Route.RelayInfo>(nav) { RelayInformationScreen(it.url, accountViewModel, nav) }
+        composableFromEndArgs<Route.RelayInfo> { RelayInformationScreen(it.url, accountViewModel, nav) }
-        composableFromEndArgs<Route.RelayManagement>(nav) { RelayManagementScreen(it.url, accountViewModel, nav) }
+        composableFromEndArgs<Route.RelayManagement> { RelayManagementScreen(it.url, accountViewModel, nav) }
-        composableFromEndArgs<Route.RelayMembers>(nav) { RelayMembersScreen(it.url, accountViewModel, nav) }
+        composableFromEndArgs<Route.RelayMembers> { RelayMembersScreen(it.url, accountViewModel, nav) }
-        composableFromEndArgs<Route.Community>(nav) { CommunityScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
+        composableFromEndArgs<Route.Community> { CommunityScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
-        composableFromEndArgs<Route.FollowPack>(nav) { FollowPackFeedScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
+        composableFromEndArgs<Route.FollowPack> { FollowPackFeedScreen(Address(it.kind, it.pubKeyHex, it.dTag), accountViewModel, nav) }
 
-        composableFromEndArgs<Route.Room>(nav) { ChatroomScreen(it.toKey(), it.message, it.replyId, it.draftId, it.expiresDays, accountViewModel, nav) }
+        composableFromEndArgs<Route.Room> { ChatroomScreen(it.toKey(), it.message, it.replyId, it.draftId, it.expiresDays, accountViewModel, nav) }
-        composableFromEndArgs<Route.RoomByAuthor>(nav) { ChatroomByAuthorScreen(it.id, null, accountViewModel, nav) }
+        composableFromEndArgs<Route.RoomByAuthor> { ChatroomByAuthorScreen(it.id, null, accountViewModel, nav) }
 
-        composableFromEnd<Route.MarmotGroupList>(nav) { MarmotGroupListScreen(accountViewModel, nav) }
+        composableFromEnd<Route.MarmotGroupList> { MarmotGroupListScreen(accountViewModel, nav) }
-        composableFromEndArgs<Route.MarmotGroupChat>(nav) { MarmotGroupChatScreen(it.nostrGroupId, accountViewModel, nav) }
+        composableFromEndArgs<Route.MarmotGroupChat> { MarmotGroupChatScreen(it.nostrGroupId, accountViewModel, nav) }
-        composableFromEndArgs<Route.MarmotGroupInfo>(nav) { MarmotGroupInfoScreen(it.nostrGroupId, accountViewModel, nav) }
+        composableFromEndArgs<Route.MarmotGroupInfo> { MarmotGroupInfoScreen(it.nostrGroupId, accountViewModel, nav) }
 
         composableFromBottom<Route.CreateMarmotGroup> { CreateGroupScreen(accountViewModel, nav) }
         composableFromBottomArgs<Route.MarmotGroupAddMember> { AddMemberScreen(it.nostrGroupId, accountViewModel, nav) }
         composableFromBottomArgs<Route.MarmotGroupRemoveMember> { RemoveMemberScreen(it.nostrGroupId, accountViewModel, nav) }
         composableFromBottomArgs<Route.MarmotGroupEditInfo> { EditGroupInfoScreen(it.nostrGroupId, accountViewModel, nav) }
 
-        composableFromEndArgs<Route.PublicChatChannel>(nav) {
+        composableFromEndArgs<Route.PublicChatChannel> {
             PublicChatChannelScreen(it.id, it.draftId, it.replyTo, accountViewModel, nav)
         }
 
-        composableFromEndArgs<Route.LiveActivityChannel>(nav) {
+        composableFromEndArgs<Route.LiveActivityChannel> {
             LiveActivityChannelScreen(
                 Address(it.kind, it.pubKeyHex, it.dTag),
                 draftId = it.draftId,
@@ -363,7 +363,7 @@ fun BuildNavigation(
             )
         }
 
-        composableFromEndArgs<Route.EphemeralChat>(nav) {
+        composableFromEndArgs<Route.EphemeralChat> {
             EphemeralChatScreen(
                 id = it.id,
                 relayUrl = it.relayUrl,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/NavigationEffects.kt

@@ -33,26 +33,26 @@ import androidx.navigation.NavBackStackEntry
 import androidx.navigation.NavGraphBuilder
 import androidx.navigation.compose.composable
 import androidx.navigation.toRoute
-import com.vitorpamplona.amethyst.ui.navigation.navs.Nav
 
-inline fun <reified T : Any> NavGraphBuilder.composableFromEnd(
+// Per-entry hint stored on NavBackStackEntry.savedStateHandle by
-    nav: Nav,
+// Nav.navBottomBar. When present, composableFromEnd skips the horizontal
-    noinline content: @Composable AnimatedContentScope.(NavBackStackEntry) -> Unit,
+// slide so bottom-bar taps fall back to the NavHost-level fade.
-) {
+const val SKIP_SLIDE_ANIMATION_KEY = "skipSlideAnimation"
+
+fun NavBackStackEntry.skipsSlideAnimation(): Boolean = savedStateHandle.get<Boolean>(SKIP_SLIDE_ANIMATION_KEY) == true
+
+inline fun <reified T : Any> NavGraphBuilder.composableFromEnd(noinline content: @Composable AnimatedContentScope.(NavBackStackEntry) -> Unit) {
     composable<T>(
-        enterTransition = { if (nav.skipSlideAnimation) null else slideInHorizontallyFromEnd },
+        enterTransition = { if (targetState.skipsSlideAnimation()) null else slideInHorizontallyFromEnd },
-        exitTransition = { if (nav.skipSlideAnimation) null else scaleOut },
+        exitTransition = { if (targetState.skipsSlideAnimation()) null else scaleOut },
-        popEnterTransition = { if (nav.skipSlideAnimation) null else scaleIn },
+        popEnterTransition = { if (initialState.skipsSlideAnimation()) null else scaleIn },
-        popExitTransition = { if (nav.skipSlideAnimation) null else slideOutHorizontallyToEnd },
+        popExitTransition = { if (initialState.skipsSlideAnimation()) null else slideOutHorizontallyToEnd },
         content = content,
     )
 }
 
-inline fun <reified T : Any> NavGraphBuilder.composableFromEndArgs(
+inline fun <reified T : Any> NavGraphBuilder.composableFromEndArgs(noinline content: @Composable AnimatedContentScope.(T) -> Unit) {
-    nav: Nav,
+    composableFromEnd<T> {
-    noinline content: @Composable AnimatedContentScope.(T) -> Unit,
-) {
-    composableFromEnd<T>(nav) {
         content(it.toRoute<T>())
     }
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/navs/Nav.kt

@@ -25,6 +25,7 @@ import androidx.compose.material3.DrawerState
 import androidx.compose.material3.DrawerValue
 import androidx.compose.runtime.Stable
 import androidx.navigation.NavHostController
+import com.vitorpamplona.amethyst.ui.navigation.SKIP_SLIDE_ANIMATION_KEY
 import com.vitorpamplona.amethyst.ui.navigation.routes.Route
 import com.vitorpamplona.amethyst.ui.navigation.routes.getRouteWithArguments
 import kotlinx.coroutines.CoroutineScope
@@ -38,11 +39,6 @@ class Nav(
 ) : INav {
     override val drawerState = DrawerState(DrawerValue.Closed)
 
-    // Read by composableFromEnd transition lambdas; true means the next
-    // navigation is a bottom-bar tab swap and should skip the slide animation.
-    @Volatile
-    var skipSlideAnimation: Boolean = false
-
     override fun closeDrawer() {
         navigationScope.launch { drawerState.close() }
     }
@@ -54,7 +50,6 @@ class Nav(
     override fun nav(route: Route) {
         navigationScope.launch {
             if (getRouteWithArguments(route::class, controller) != route) {
-                skipSlideAnimation = false
                 controller.navigate(route)
             }
         }
@@ -64,7 +59,6 @@ class Nav(
         navigationScope.launch {
             val route = computeRoute()
             if (route != null && getRouteWithArguments(route::class, controller) != route) {
-                skipSlideAnimation = false
                 controller.navigate(route)
             }
         }
@@ -72,7 +66,6 @@ class Nav(
 
     override fun newStack(route: Route) {
         navigationScope.launch {
-            skipSlideAnimation = false
             controller.navigate(route) {
                 popUpTo(route) {
                     inclusive = true
@@ -84,13 +77,15 @@ class Nav(
 
     override fun navBottomBar(route: Route) {
         navigationScope.launch {
-            skipSlideAnimation = true
             controller.navigate(route) {
                 popUpTo(route) {
                     inclusive = true
                 }
                 launchSingleTop = true
             }
+            // Stamp the entry so composableFromEnd's transition lambdas can
+            // skip the slide animation when this entry enters or exits.
+            controller.getBackStackEntry(route).savedStateHandle[SKIP_SLIDE_ANIMATION_KEY] = true
         }
     }
 
@@ -106,7 +101,6 @@ class Nav(
         klass: KClass<T>,
     ) {
         navigationScope.launch {
-            skipSlideAnimation = false
             controller.navigate(route) {
                 popUpTo(klass) { inclusive = true }
             }