fix blink favorite icon

core/data/src/commonMain/kotlin/io/github/droidkaigi/confsched/data/sessions/DefaultSessionsRepository.kt

@@ -17,6 +17,7 @@ import io.github.droidkaigi.confsched.model.SessionsRepository
 import io.github.droidkaigi.confsched.model.Timetable
 import io.github.droidkaigi.confsched.model.TimetableItem
 import io.github.droidkaigi.confsched.model.TimetableItemId
+import kotlinx.collections.immutable.PersistentSet
 import kotlinx.collections.immutable.persistentSetOf
 import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.flow.Flow
@@ -90,6 +91,9 @@ public class DefaultSessionsRepository(
     @Composable
     public override fun timetable(): Timetable {
         var first by remember { mutableStateOf(true) }
+        var favoriteSessions: PersistentSet<TimetableItemId> by remember {
+            mutableStateOf(userDataStore.getFavoriteSessionMemoryCacheOrNull ?: persistentSetOf())
+        }
         SafeLaunchedEffect(first) {
             if (first) {
                 Logger.d("DefaultSessionsRepository onStart getTimetableStream()")
@@ -99,6 +103,12 @@ public class DefaultSessionsRepository(
             }
         }
 
+        SafeLaunchedEffect(Unit) {
+            userDataStore.getFavoriteSessionStream().collect {
+                favoriteSessions = it
+            }
+        }
+
         val timetable by remember {
             sessionCacheDataStore.getTimetableStream().catch { e ->
                 Logger.d(
@@ -109,10 +119,6 @@ public class DefaultSessionsRepository(
                 emitAll(sessionCacheDataStore.getTimetableStream())
             }
         }.safeCollectAsRetainedState(Timetable())
-        val favoriteSessions by remember {
-            userDataStore.getFavoriteSessionStream()
-        }.safeCollectAsRetainedState(persistentSetOf())
-
         Logger.d { "DefaultSessionsRepository timetable() count=${timetable.timetableItems.size}" }
         return timetable.copy(bookmarks = favoriteSessions)
     }

core/data/src/commonMain/kotlin/io/github/droidkaigi/confsched/data/user/UserDataStore.kt

@@ -21,10 +21,15 @@ public class UserDataStore(private val dataStore: DataStore<Preferences>) {
     private val mutableIdToken = MutableStateFlow<String?>(null)
     public val idToken: StateFlow<String?> = mutableIdToken
 
+    private var favoriteSessionMemoryCache: PersistentSet<TimetableItemId>? = null
+    public val getFavoriteSessionMemoryCacheOrNull: PersistentSet<TimetableItemId>?
+        get() = favoriteSessionMemoryCache
+
     public fun getFavoriteSessionStream(): Flow<PersistentSet<TimetableItemId>> {
         return dataStore.data
             .catch { exception ->
                 if (exception is IOException) {
+                    favoriteSessionMemoryCache = null
                     emit(emptyPreferences())
                 } else {
                     throw exception
@@ -33,7 +38,9 @@ public class UserDataStore(private val dataStore: DataStore<Preferences>) {
             .map { preferences: Preferences ->
                 (preferences[KEY_FAVORITE_SESSION_IDS]?.split(",") ?: listOf())
                     .map { TimetableItemId(it) }
-                    .toPersistentSet()
+                    .toPersistentSet().also {
+                        favoriteSessionMemoryCache = it
+                    }
             }
     }