Enable Offline mode of the SyncService, so that the sync starts automatically when the network is back.

Also rely on the sync state to render the "Offline" banner.

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/RustMatrixClientFactory.kt

@@ -74,6 +74,7 @@ class RustMatrixClientFactory @Inject constructor(
 
         val syncService = client.syncService()
             .withUtdHook(UtdTracker(analyticsService))
+            .withOfflineMode()
             .finish()
 
         return RustMatrixClient(

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/di/SessionMatrixModule.kt

@@ -19,6 +19,7 @@ import io.element.android.libraries.matrix.api.notificationsettings.Notification
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
 import io.element.android.libraries.matrix.api.roomdirectory.RoomDirectoryService
 import io.element.android.libraries.matrix.api.roomlist.RoomListService
+import io.element.android.libraries.matrix.api.sync.SyncService
 import io.element.android.libraries.matrix.api.verification.SessionVerificationService
 import kotlinx.coroutines.CoroutineScope
 
@@ -45,6 +46,11 @@ object SessionMatrixModule {
         return matrixClient.roomListService
     }
 
+    @Provides
+    fun providesSyncService(matrixClient: MatrixClient): SyncService {
+        return matrixClient.syncService()
+    }
+
     @Provides
     fun providesEncryptionService(matrixClient: MatrixClient): EncryptionService {
         return matrixClient.encryptionService()

libraries/matrix/impl/src/test/kotlin/io/element/android/libraries/matrix/impl/fixtures/fakes/FakeRustSyncServiceBuilder.kt

@@ -14,5 +14,6 @@ import org.matrix.rustcomponents.sdk.UnableToDecryptDelegate
 
 class FakeRustSyncServiceBuilder : SyncServiceBuilder(NoPointer) {
     override suspend fun withUtdHook(delegate: UnableToDecryptDelegate): SyncServiceBuilder = this
+    override fun withOfflineMode(): SyncServiceBuilder = this
     override suspend fun finish(): SyncService = FakeRustSyncService()
 }