Preserve TV Back viewports and person-switch authority

app/src/main/java/com/github/damontecres/wholphin/data/ServerRepository.kt

@@ -21,6 +21,8 @@ import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
 import kotlinx.serialization.Serializable
 import org.jellyfin.sdk.Jellyfin
@@ -51,6 +53,7 @@ class ServerRepository
         @param:IoDispatcher private val ioDispatcher: CoroutineDispatcher,
         private val mostRecentServerProvider: MostRecentServerProvider,
     ) {
+        private val userChangeMutex = Mutex()
         private var _current = MutableStateFlow<CurrentUser?>(null)
         val current: StateFlow<CurrentUser?> = _current
 
@@ -100,33 +103,35 @@ class ServerRepository
             user: JellyfinUser,
         ): CurrentUser =
             withContext(ioDispatcher) {
-                if (server.id != user.serverId) {
-                    throw IllegalStateException("User is not part of the server")
-                }
-                Timber.v("Changing user to ${user.name} on ${server.url}")
-                val previous = _current.value
-                apiClient.update(baseUrl = server.url, accessToken = user.accessToken)
-                try {
-                    val (updatedServer, userDto) = readSession(server)
-                    var updatedUser =
-                        user.copy(
-                            id = userDto.id,
-                            name = userDto.name,
-                        )
-                    serverDao.addOrUpdateServer(updatedServer)
-                    updatedUser = serverDao.addOrUpdateUser(updatedUser)
+                userChangeMutex.withLock {
+                    if (server.id != user.serverId) {
+                        throw IllegalStateException("User is not part of the server")
+                    }
+                    Timber.v("Changing user to ${user.name} on ${server.url}")
+                    val previous = _current.value
+                    apiClient.update(baseUrl = server.url, accessToken = user.accessToken)
+                    try {
+                        val (updatedServer, userDto) = readSession(server)
+                        var updatedUser =
+                            user.copy(
+                                id = userDto.id,
+                                name = userDto.name,
+                            )
+                        serverDao.addOrUpdateServer(updatedServer)
+                        updatedUser = serverDao.addOrUpdateUser(updatedUser)
 
-                    val currentUser = CurrentUser(updatedServer, updatedUser)
-                    currentCoroutineContext().ensureActive()
-                    mostRecentServerProvider.save(currentUser)
-                    currentCoroutineContext().ensureActive()
-                    _current.value = currentUser
-                    _currentUserDto.value = ServerUserConfig(userDto)
-                    return@withContext currentUser
-                } catch (exception: Exception) {
-                    // A failed or cancelled selection must not lend its token to the still-signed-in person.
-                    apiClient.update(baseUrl = previous?.server?.url, accessToken = previous?.user?.accessToken)
-                    throw exception
+                        val currentUser = CurrentUser(updatedServer, updatedUser)
+                        currentCoroutineContext().ensureActive()
+                        mostRecentServerProvider.save(currentUser)
+                        currentCoroutineContext().ensureActive()
+                        _current.value = currentUser
+                        _currentUserDto.value = ServerUserConfig(userDto)
+                        currentUser
+                    } catch (exception: Exception) {
+                        // A failed or cancelled selection must not lend its token to the still-signed-in person.
+                        apiClient.update(baseUrl = previous?.server?.url, accessToken = previous?.user?.accessToken)
+                        throw exception
+                    }
                 }
             }
 

app/src/test/java/com/github/damontecres/wholphin/services/ServerSavedSessionTest.kt

@@ -15,6 +15,8 @@ import kotlinx.coroutines.awaitCancellation
 import kotlinx.coroutines.withTimeoutOrNull
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.async
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.withContext
 import kotlinx.coroutines.test.StandardTestDispatcher
 import kotlinx.coroutines.test.runCurrent
 import kotlinx.coroutines.test.runTest
@@ -117,6 +119,36 @@ class ServerSavedSessionTest {
         verifyFailedSwitch(cancel = true)
     }
 
+    @Test fun cancelledOlderSwitchCannotReplaceTheNewerAuthenticatedToken() = runTest(dispatcher) {
+        var activeToken: String? = null
+        every { api.update(any(), any(), any(), any()) } answers { activeToken = secondArg() }
+        repository.restoreSavedSession()
+        val older = dao.addOrUpdateUser(user.copy(rowId = 0, id = UUID.randomUUID(), name = "Older selection", accessToken = "older-token"))
+        val newer = dao.addOrUpdateUser(user.copy(rowId = 0, id = UUID.randomUUID(), name = "Newer selection", accessToken = "newer-token"))
+        val entered = CompletableDeferred<Unit>()
+        val release = CompletableDeferred<Unit>()
+        coEvery { recent.save(any()) } just Runs
+        coEvery { users.getCurrentUser() } coAnswers {
+            if (activeToken == older.accessToken) {
+                entered.complete(Unit)
+                withContext(NonCancellable) { release.await() }
+                throw IOException("late failed selection")
+            }
+            successResponse(dto.copy(id = newer.id, name = newer.name))
+        }
+        val pending = async { runCatching { repository.changeUser(server, older) } }
+        entered.await()
+        pending.cancel()
+        val selected = async { repository.changeUser(server, newer) }
+        runCurrent()
+        release.complete(Unit)
+        pending.join()
+        val current = selected.await()
+        assertEquals(newer.id, current.user.id)
+        assertEquals(current, repository.current.value)
+        assertEquals(newer.accessToken, activeToken)
+    }
+
     private suspend fun verifyFailedSwitch(cancel: Boolean) {
         var activeToken: String? = null
         every { api.update(any(), any(), any(), any()) } answers { activeToken = secondArg() }

app/src/test/java/org/justinvisser/wolfskin/tv/OfflinePersonSwitchTest.kt

@@ -132,6 +132,25 @@ class OfflinePersonSwitchTest {
         assertEquals(original, current.value)
     }
 
+    @Test fun failedAvatarSwitchRestoresOnlyTheOriginalHouseholdSession() {
+        failSwitch(fromAvatar = true)
+        await { conductarr.identity.value?.signedIn == true }
+        val identity = requireNotNull(conductarr.identity.value)
+        assertEquals("${server.id}:${users.first().id}", identity.person)
+        assertEquals("justin", identity.operator!!.requester)
+        assertEquals(original, current.value)
+    }
+
+    @Test fun expiredTargetCredentialsStillOpenTheSignInGate() {
+        coEvery { repository.changeUser(server, users[1]) } throws org.jellyfin.sdk.api.client.exception.InvalidStatusException(401)
+        failSwitch(fromAvatar = true)
+        await { rule.onAllNodesWithTag("wolfskin-setup-picker").fetchSemanticsNodes().isNotEmpty() }
+        rule.onNodeWithText("Mindel").performClick()
+        await { setupModel.stage == WolfskinSetupViewModel.Stage.Login }
+        rule.onNodeWithTag("profile-password").assertIsDisplayed()
+        assertEquals(original, current.value)
+    }
+
     @Test fun failedLaunchPickerSelectionBackExitsWithoutChangingIdentity() {
         failSwitch(fromAvatar = false)
         back()

app/src/test/java/org/justinvisser/wolfskin/tv/TitleEntryBackTest.kt

@@ -5,6 +5,8 @@ import android.os.Build
 import android.os.Looper
 import androidx.activity.ComponentActivity
 import androidx.activity.BackEventCompat
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.ui.Modifier
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.ui.input.key.Key
@@ -19,15 +21,28 @@ import java.io.File
 import androidx.lifecycle.viewModelScope
 import androidx.navigation3.runtime.NavEntry
 import androidx.navigation3.ui.NavDisplay
+import com.github.damontecres.wholphin.MainContent
+import com.github.damontecres.wholphin.SignedInContent
+import com.github.damontecres.wholphin.data.CurrentUser
 import com.github.damontecres.wholphin.data.ServerRepository
 import com.github.damontecres.wholphin.preferences.AppPreferences
 import com.github.damontecres.wholphin.preferences.UserPreferences
 import com.github.damontecres.wholphin.services.NavigationManager
+import com.github.damontecres.wholphin.services.BackdropService
+import com.github.damontecres.wholphin.services.BackdropResult
+import com.github.damontecres.wholphin.services.ScreensaverService
+import com.github.damontecres.wholphin.services.ScreensaverState
+import com.github.damontecres.wholphin.services.SetupDestination
 import com.github.damontecres.wholphin.ui.nav.Destination
+import com.github.damontecres.wholphin.util.WholphinDispatchers
 import io.mockk.coEvery
+import io.mockk.every
 import io.mockk.mockk
 import java.util.UUID
 import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.test.StandardTestDispatcher
 import org.junit.After
 import org.junit.Assert.*
 import org.junit.Rule
@@ -44,21 +59,32 @@ import org.robolectric.annotation.GraphicsMode
 
 /** Real NavDisplay and system/predictive Back must pop one title/person entry before the root ladder. */
 @RunWith(RobolectricTestRunner::class)
-@Config(sdk = [34, 36], application = Application::class, qualifiers = "w960dp-h540dp-xhdpi")
+@Config(sdk = [34, 36], application = Application::class, qualifiers = "w960dp-h540dp-television-xhdpi")
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
+@OptIn(kotlinx.coroutines.ExperimentalCoroutinesApi::class)
 class TitleEntryBackTest {
-    @get:Rule val rule = createAndroidComposeRule<ComponentActivity>()
+    private var systemAnimationScale = 1f
+    @get:Rule val rule = createAndroidComposeRule<ComponentActivity>(
+        effectContext = object : androidx.compose.ui.MotionDurationScale {
+            override val scaleFactor get() = systemAnimationScale
+        },
+    )
     private lateinit var viewModel: WolfskinTitleViewModel
     private lateinit var conductarr: ConductarrSession
     private var homeModel: WolfskinHomeViewModel? = null
     private var shellModel: WolfskinShellViewModel? = null
     private var previousFixtures: Boolean? = null
+    private var previousHomeIo: CoroutineDispatcher? = null
+    private var previousLeanback: Boolean? = null
 
     @After fun dispose() {
         rule.mainClock.autoAdvance = true
         if (::viewModel.isInitialized) viewModel.viewModelScope.cancel()
         homeModel?.viewModelScope?.cancel()
         shellModel?.viewModelScope?.cancel()
+        previousHomeIo?.let { WholphinDispatchers.IO = it }
+        previousHomeIo = null
+        previousLeanback?.let { org.robolectric.Shadows.shadowOf(rule.activity.packageManager).setSystemFeature(android.content.pm.PackageManager.FEATURE_LEANBACK, it) }
         previousFixtures?.let(ConductarrPreference::updateFixtures)
         if (::conductarr.isInitialized) conductarr.close()
     }
@@ -72,10 +98,21 @@ class TitleEntryBackTest {
     @Test fun reducedMotionHomeTitleBackKeepsTheExactPreOpenViewport() = verifyHomeViewport(reduced = true, depth = 1)
     @Test fun deepHomeTitleBackKeepsTheExactPreOpenViewport() = verifyHomeViewport(reduced = false, depth = 8)
     @Test fun sharedHomeTitleBackKeepsTheExactPreOpenViewport() = verifyHomeViewport(reduced = false, depth = 1, person = "shared")
+    @Test fun loadingHomeTitleBackKeepsTheExactPreOpenViewport() = verifyHomeViewport(reduced = false, depth = 1, person = "shared", paintLoading = true)
+    @Test fun systemAnimationsOffHomeTitleBackKeepsTheExactPreOpenViewport() = verifyHomeViewport(reduced = false, depth = 1, person = "shared", systemScale = 0f)
 
-    private fun verifyHomeViewport(reduced: Boolean, depth: Int, person: String = "justin") {
+    private fun verifyHomeViewport(reduced: Boolean, depth: Int, person: String = "justin", paintLoading: Boolean = false, systemScale: Float = 1f) {
+        // A television qualifier alone does not advertise Leanback or leave Robolectric's touch mode.
+        systemAnimationScale = systemScale
+        val packageManager = rule.activity.packageManager
+        previousLeanback = packageManager.hasSystemFeature(android.content.pm.PackageManager.FEATURE_LEANBACK)
+        org.robolectric.Shadows.shadowOf(packageManager).setSystemFeature(android.content.pm.PackageManager.FEATURE_LEANBACK, true)
         val navigation = NavigationManager()
         val session = WolfskinSession()
+        val heldReads = if (paintLoading) StandardTestDispatcher().also {
+            previousHomeIo = WholphinDispatchers.IO
+            WholphinDispatchers.IO = it
+        } else null
         conductarr = ConductarrSession(MemoryCacheStore())
         ConductarrPreference.initialize(rule.activity)
         previousFixtures = ConductarrPreference.fixtures
@@ -84,21 +121,40 @@ class TitleEntryBackTest {
         val user = com.github.damontecres.wholphin.data.model.JellyfinUser(id = UUID.fromString("00000000-0000-0000-0000-000000000002"), name = person.replaceFirstChar { it.uppercase() }, serverId = server.id, accessToken = null)
         viewModel = WolfskinTitleViewModel(rule.activity, mockk(), TitleFixtureProvider(rule.activity), navigation, conductarr,
             mockk(relaxed = true), mockk(relaxed = true), trailerReturn = mockk(relaxed = true))
+        val backdrop = mockk<BackdropService>(relaxed = true)
+        every { backdrop.backdropFlow } returns MutableStateFlow(BackdropResult.NONE)
         val app = WolfskinShellViewModel(rule.activity, session, mockk(relaxed = true), navigation, mockk(relaxed = true),
-            mockk(relaxed = true), mockk(relaxed = true), WolfskinSeeAllLists(), conductarr, mockk(relaxed = true),
+            backdrop, mockk(relaxed = true), WolfskinSeeAllLists(), conductarr, mockk(relaxed = true),
             org.justinvisser.wolfskin.tv.update.FakeUpdateController(), mockk(relaxed = true))
         shellModel = app
         val preferences = UserPreferences(AppPreferences.getDefaultInstance(), null)
+        val current = CurrentUser(server, user)
+        val live = MutableStateFlow<CurrentUser?>(current)
+        val setup = androidx.compose.runtime.mutableStateListOf<SetupDestination>(SetupDestination.AppContent(current))
+        val trailer = mockk<TrailerReturnState>(relaxed = true)
+        val screensaver = mockk<ScreensaverService>(relaxed = true)
+        every { screensaver.state } returns MutableStateFlow(ScreensaverState(false, false, false, false))
         rule.setContent { CompositionLocalProvider(LocalReducedMotion provides reduced) {
-            WolfskinApp(server, user, navigation, preferences, viewModel = app,
-                homeContent = { shell, homeServer, homeUser, modifier ->
-                    val source = androidx.lifecycle.viewmodel.compose.viewModel {
-                        WolfskinHomeViewModel(rule.activity, mockk(relaxed = true), mockk(), navigation, WolfskinSeeAllLists(), conductarr, session)
+            val inputMode = androidx.compose.ui.platform.LocalInputModeManager.current
+            androidx.compose.runtime.LaunchedEffect(inputMode) { inputMode.requestInputMode(androidx.compose.ui.input.InputMode.Keyboard) }
+            MainContent(setup, navigation, preferences, backdrop, screensaver, live, trailer,
+                modifier = Modifier.fillMaxSize(),
+                setupInterceptor = { destination, modifier ->
+                    val entry = (destination as SetupDestination.AppContent).current
+                    SignedInContent(entry, live, preferences.appPreferences.signInAutomatically, trailer,
+                        { navigation.backStack.lastOrNull() }) {
+                        WolfskinApp(entry.server, entry.user, navigation, preferences, modifier, app,
+                            homeContent = { shell, homeServer, homeUser, contentModifier ->
+                                val source = androidx.lifecycle.viewmodel.compose.viewModel {
+                                    WolfskinHomeViewModel(rule.activity, mockk(relaxed = true), mockk(), navigation, WolfskinSeeAllLists(), conductarr, session)
+                                }
+                                homeModel = source
+                                HomeDestination(shell, homeServer, homeUser, contentModifier, source)
+                            },
+                            titleContent = { route, shell, settings -> TitleDestination(route, shell, settings, viewModel = viewModel, fixtures = true) })
                     }
-                    homeModel = source
-                    HomeDestination(shell, homeServer, homeUser, modifier, source)
-                },
-                titleContent = { route, shell, settings -> TitleDestination(route, shell, settings, viewModel = viewModel, fixtures = true) })
+                    true
+                })
         } }
         rule.waitUntil(30_000) {
             androidx.compose.runtime.snapshots.Snapshot.sendApplyNotifications()
@@ -106,6 +162,20 @@ class TitleEntryBackTest {
             session.state != null && app.signedInPerson == person
         }
         rule.onRoot().performKeyInput { pressKey(Key.DirectionCenter) }
+        if (heldReads != null) {
+            rule.waitUntil(30_000) {
+                Snapshot.sendApplyNotifications()
+                Shadows.shadowOf(Looper.getMainLooper()).idle()
+                homeModel != null && session.personCommit == null
+            }
+            rule.onNodeWithTag("wolfskin-home").assertExists()
+            assertEquals(HomeAvailability.Loading, homeModel!!.snapshot.conductarr)
+            val loadingCaptures = File(System.getProperty("wolfskin.captureDirectory"), "home-loading-$person").apply { mkdirs() }
+            rule.onRoot().captureRoboImage(File(loadingCaptures, "sdk${Build.VERSION.SDK_INT}.png").absolutePath)
+            heldReads.scheduler.runCurrent()
+            WholphinDispatchers.IO = previousHomeIo!!
+            previousHomeIo = null
+        }
         rule.waitUntil(30_000) {
             androidx.compose.runtime.snapshots.Snapshot.sendApplyNotifications()
             Shadows.shadowOf(Looper.getMainLooper()).idle()
@@ -120,7 +190,8 @@ class TitleEntryBackTest {
         val tag = "home-card:${snapshot.rows[home.row].id}:0"
         val before = home.listState.let { it.firstVisibleItemIndex to it.firstVisibleItemScrollOffset }
         val bounds = rule.onNodeWithTag(tag).fetchSemanticsNode().boundsInRoot
-        val captures = File(System.getProperty("wolfskin.captureDirectory"), "home-title-back-$person-${if (reduced) "reduced" else "animated"}-$depth").apply { mkdirs() }
+        val motion = if (systemScale == 0f) "system-off" else if (reduced) "reduced" else "animated"
+        val captures = File(System.getProperty("wolfskin.captureDirectory"), "home-title-back-$person-$motion-$depth${if (paintLoading) "-loading" else ""}").apply { mkdirs() }
         rule.onRoot().captureRoboImage(File(captures, "sdk${Build.VERSION.SDK_INT}-before.png").absolutePath)
         rule.onRoot().performKeyInput { pressKey(Key.DirectionCenter) }
         rule.waitUntil(30_000) {
@@ -144,6 +215,14 @@ class TitleEntryBackTest {
         rule.onRoot().captureRoboImage(File(captures, "sdk${Build.VERSION.SDK_INT}-after.png").absolutePath)
         val after = home.listState.let { it.firstVisibleItemIndex to it.firstVisibleItemScrollOffset }
         val afterBounds = rule.onNodeWithTag(tag).fetchSemanticsNode().boundsInRoot
+        rule.mainClock.advanceTimeBy(1000)
+        Shadows.shadowOf(Looper.getMainLooper()).idleFor(java.time.Duration.ofMillis(1000))
+        rule.waitForIdle()
+        rule.onRoot().captureRoboImage(File(captures, "sdk${Build.VERSION.SDK_INT}-settled.png").absolutePath)
+        val settled = home.listState.let { it.firstVisibleItemIndex to it.firstVisibleItemScrollOffset }
+        val settledBounds = rule.onNodeWithTag(tag).fetchSemanticsNode().boundsInRoot
+        assertEquals("settled card bounds before=$bounds after=$settledBounds; list before=$before after=$settled", before, settled)
+        assertEquals(bounds, settledBounds)
         assertEquals("card bounds before=$bounds after=$afterBounds; list before=$before after=$after", before, after)
         assertEquals(bounds, afterBounds)
     }

app/src/wolfskin/java/org/justinvisser/wolfskin/tv/WolfskinApp.kt

@@ -56,6 +56,7 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
 import org.jellyfin.sdk.model.serializer.toUUIDOrNull
+import org.jellyfin.sdk.api.client.exception.InvalidStatusException
 import kotlinx.coroutines.withContext
 import org.justinvisser.wolfskin.design.PeopleStatus
 import org.justinvisser.wolfskin.design.SettingsList
@@ -280,11 +281,14 @@ class WolfskinShellViewModel @Inject constructor(
                         coroutineContext.ensureActive()
                         val open = {
                             val current = repository.current.value
-                            if (current?.server?.id == server.id && current.user.id == user.id) {
+                            val isAuthenticationFailure = exception is InvalidStatusException && (exception.status == 401 || exception.status == 403)
+                            if (!isAuthenticationFailure && current?.server?.id == server.id && current.user.id == user.id) {
                                 signedInPerson = previousPerson
                                 session.state?.restorePersonPicker(previousPerson, selection.fromLaunch)
                                 session.state?.toast = org.justinvisser.wolfskin.design.RecoveryMessage.PersonSwitchUnavailable
-                            } else openSwitchRecovery(server)
+                                identityJob = viewModelScope.launch { retryConductarr(server, user) }
+                            } else if (isAuthenticationFailure) setupNavigation.navigateTo(SetupDestination.UserList(server))
+                            else openSwitchRecovery(server)
                         }
                         if (commit == null) open() else commit.fallback = open
                     }

docker/README.md

@@ -221,12 +221,16 @@ shows “The household server didn’t answer.” Back from a reopened avatar pi
 dismisses to that person's navigation; the next Back exits. Back from a launch or
 setup picker exits instead of exposing a previous person's content. Settings,
 login and error panels return to the picker first; Back can exit a busy setup
-request. PIN and require-login selection rules are unchanged.
+request. PIN, require-login and rejected-credential authentication gates remain
+strict: an expired target sign-in still reaches the setup login form.
 
 Failed or cancelled Jellyfin switches restore the previous API token as well as
-retaining the signed-in identity. A person-switch cover has a ten-second deadline;
+retaining the signed-in identity. Recovering the picker also reattaches only that
+person's household client. A person-switch cover has a ten-second deadline;
 an unfinished switch/replacement falls back to the setup picker with a message,
-without choosing a different authenticated person.
+without choosing a different authenticated person. Repository user changes share
+one transaction gate, so late cancellation/rollback cannot overwrite a newer
+person's authenticated token.
 
 Jellyfin, Conductarr, artwork, playback and crash-report clients share one
 `PersistentDns` instance through the application graph. It keeps system-ordered
@@ -649,6 +653,10 @@ shell's logical focus without requests against uncomposed lazy items.
 Back preserves the viewport; returning to Home does not re-run focus-follow over
 a manually scrolled saved view. The next arrow re-enters visible content when
 scrolling moved focus off-screen.
+Shell-owned Home, Library/See all, Discover and Settings/Updates lists use
+Foundation's minimum-visibility bring-into-view policy, not TV's 30% focus pivot.
+Restoring focus therefore leaves already-visible cards at their saved position;
+native title/person and legacy handoffs retain their inherited policy.
 Pointing changes focus without activation, cards activate on key-up, and held
 OK events cannot activate twice.
 Between Home shelves, an unvisited row starts at its leftmost card. A visited row
@@ -971,12 +979,15 @@ retain the approved frames except for the requested feedback changes:
   cache, 128 MiB disk cache and four image-read limit remain unchanged.
 
 `HomeViewportTest` covers short/long poster, tile and wide rows, both row
-directions, first focus and exact scroll/card bounds after native Back from the
-actual title surface. `TitleEntryBackTest` also checks the production Home/title
-loaders through `NavDisplay` and its entry decorators on SDK 34 and 36, with
-animation and reduced motion. Native proof records real Bear season-three
-metadata through the title read facade; the proof-only harness is not part of
-the shipped tests or APK.
+directions, first focus and exact scroll/card bounds after returning from the
+actual title surface. `TitleEntryBackTest` also checks production MainContent,
+the Home/title loaders, `NavDisplay` decorators and native system Back on SDK 34
+and 36. It models Leanback capabilities and keyboard input, animation/reduced
+motion, initial Home loading and system animation scale zero. Phone/touch-mode
+tests miss the TV focus pivot; the zero-scale regression reproduced the exact
+72-pixel drift before the shared policy fix. Native proof records real Bear
+season-three metadata through the title read facade; the proof-only harness is
+not part of the shipped tests or APK.
 
 Episode lists request only ProviderIds and Overview. Next up reads only identity,
 then hydrates the selected playback target through the existing single-item read,

wolfskin-design/src/main/java/org/justinvisser/wolfskin/design/ShellSurface.kt

@@ -1,6 +1,9 @@
 package org.justinvisser.wolfskin.design
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.gestures.BringIntoViewSpec
+import androidx.compose.foundation.gestures.LocalBringIntoViewSpec
 import androidx.compose.foundation.focusable
 import androidx.compose.foundation.focusGroup
 import androidx.compose.ui.focus.focusRestorer
@@ -10,6 +13,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.offset
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
@@ -32,6 +36,9 @@ import androidx.tv.material3.Text
 import org.justinvisser.wolfskin.design.WolfskinTokens.Color as C
 import org.justinvisser.wolfskin.design.WolfskinTokens.Layout as L
 
+@OptIn(ExperimentalFoundationApi::class)
+private object MinimumScrollBringIntoViewSpec : BringIntoViewSpec
+
 /** Native Back belongs to the Activity dispatcher; Escape remains the local Back shortcut. */
 fun readShellKey(event: KeyEvent): ShellKey? = when (event.key) {
     Key.DirectionUp -> ShellKey.Up
@@ -51,6 +58,7 @@ fun ShellState.handleKey(event: KeyEvent): Boolean {
 
 /** Content and nav share a single focus policy; upstream full-screen pages bypass this surface. */
 @Composable
+@OptIn(ExperimentalFoundationApi::class)
 fun ShellSurface(
     state: ShellState,
     modifier: Modifier = Modifier,
@@ -96,8 +104,13 @@ fun ShellSurface(
         if (state.pickerVisible) {
             WhosWatching(state)
         } else {
-            FocusRingHost {
-                if (state.route == "settings") SettingsList(state, requestCount = settingsRequestCount ?: state.requests.snapshot.requestCount, installedVersion = settingsInstalledVersion) else content(Modifier.fillMaxSize().focusRequester(contentFocus).focusRestorer().focusGroup())
+            // Logical-focus screens own their scroll position; TV's 30% focus pivot must not recenter it.
+            CompositionLocalProvider(
+                LocalBringIntoViewSpec provides if (handlesContentKeys) MinimumScrollBringIntoViewSpec else LocalBringIntoViewSpec.current,
+            ) {
+                FocusRingHost {
+                    if (state.route == "settings") SettingsList(state, requestCount = settingsRequestCount ?: state.requests.snapshot.requestCount, installedVersion = settingsInstalledVersion) else content(Modifier.fillMaxSize().focusRequester(contentFocus).focusRestorer().focusGroup())
+                }
             }
             NavBar(state, view.listState.firstVisibleItemIndex > 0 || view.listState.firstVisibleItemScrollOffset > L.navSolidAfter.value * 2)
             ComingInSheet(state)