lib/api/marianumcloud/talk/chat/long_poll_chat.dart

@@ -0,0 +1,69 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
+
+import '../../../errors/network_exception.dart';
+import '../../../errors/server_exception.dart';
+import '../../nextcloud_ocs.dart';
+import 'get_chat_params.dart';
+import 'get_chat_response.dart';
+
+/// Long-poll variant of GetChat (`lookIntoFuture=1`). Bypasses [TalkApi]
+/// because that layer treats non-2xx as errors, and we need 304 to be a
+/// normal "no new messages" outcome. `setReadMarker=on` lets the server
+/// move the read cursor whenever the call returns messages.
+class LongPollChat {
+  final String chatToken;
+  final int lastKnownMessageId;
+  final int timeoutSeconds;
+
+  LongPollChat({
+    required this.chatToken,
+    required this.lastKnownMessageId,
+    this.timeoutSeconds = 30,
+  });
+
+  /// Returns the response, or `null` on HTTP 304 (server timeout, nothing new).
+  Future<GetChatResponse?> run() async {
+    final params = GetChatParams(
+      lookIntoFuture: GetChatParamsSwitch.on,
+      timeout: timeoutSeconds,
+      lastKnownMessageId: lastKnownMessageId,
+      includeLastKnown: GetChatParamsSwitch.off,
+      setReadMarker: GetChatParamsSwitch.on,
+      limit: 100,
+    );
+    final uri = NextcloudOcs.uri(
+      'apps/spreed/api/v1/chat/$chatToken',
+      queryParameters: params.toJson(),
+    );
+    final headers = NextcloudOcs.headers();
+
+    final http.Response response;
+    try {
+      response = await http
+          .get(uri, headers: headers)
+          .timeout(Duration(seconds: timeoutSeconds + 15));
+    } on TimeoutException catch (e) {
+      throw NetworkException.timeout(technicalDetails: 'LongPollChat $uri: $e');
+    } on SocketException catch (e) {
+      throw NetworkException(technicalDetails: 'LongPollChat $uri: ${e.message}');
+    } on http.ClientException catch (e) {
+      throw NetworkException(technicalDetails: 'LongPollChat $uri: ${e.message}');
+    }
+
+    final status = response.statusCode;
+    if (status == 304) return null;
+    if (status >= 200 && status < 300) {
+      final decoded = jsonDecode(response.body) as Map<String, dynamic>;
+      return GetChatResponse.fromJson(decoded['ocs'] as Map<String, dynamic>)
+        ..headers = response.headers;
+    }
+    throw ServerException(
+      statusCode: status,
+      technicalDetails: 'LongPollChat $uri: HTTP $status',
+    );
+  }
+}

lib/api/marianumcloud/talk/set_read_marker/set_read_marker.dart

@@ -26,11 +26,5 @@ class SetReadMarker extends TalkApi {
     Uri uri,
     Object? body,
     Map<String, String>? headers,
-  ) {
-    if (readState) {
-      return http.post(uri, headers: headers);
-    } else {
-      return http.delete(uri, headers: headers);
-    }
-  }
+  ) => readState ? http.post(uri, headers: headers) : http.delete(uri, headers: headers);
 }

lib/app.dart

@@ -36,17 +36,33 @@ class App extends StatefulWidget {
 }
 
 class _AppState extends State<App> with WidgetsBindingObserver {
-  late Timer _refetchChats;
   late Timer _updateTimings;
   StreamSubscription<dynamic>? _timetableWidgetSync;
-  // Tracked via the bottom-nav controller's listener so it always reflects the
-  // user's actual position, even between rapid setting emits where the
-  // controller hasn't caught up to a scheduled jump yet.
+  StreamSubscription<RemoteMessage>? _onMessageSub;
+  StreamSubscription<RemoteMessage>? _onMessageOpenedAppSub;
+  StreamSubscription<String>? _fcmTokenRefreshSub;
   int _knownTotalTabs = 1;
   bool _userOnLastTab = false;
 
+  static const Duration _chatListActiveInterval = Duration(seconds: 15);
+  static const Duration _chatListIdleInterval = Duration(seconds: 60);
+
   void _onTabControllerChanged() {
     _userOnLastTab = Main.bottomNavigator.index == _knownTotalTabs - 1;
+    _syncChatListPolling();
+  }
+
+  void _syncChatListPolling() {
+    if (!mounted) return;
+    final modules = AppModule.getBottomBarModules(context);
+    final talkSlot = modules.indexWhere((m) => m.module == Modules.talk);
+    final talkIsActive =
+        talkSlot >= 0 && Main.bottomNavigator.index == talkSlot;
+    final bloc = context.read<ChatListBloc>();
+    bloc.setAutoRefreshInterval(
+      talkIsActive ? _chatListActiveInterval : _chatListIdleInterval,
+    );
+    if (talkIsActive) bloc.refresh();
   }
 
   @override
@@ -65,13 +81,12 @@ class _AppState extends State<App> with WidgetsBindingObserver {
   Future<void> _handlePendingWidgetNavigation() async {
     final pending = await WidgetNavigation.consumePendingTimetableTap();
     if (!pending || !mounted) return;
-    // Routes pushed with `withNavBar: false` (chat views, file viewers, …)
-    // sit on the root navigator above the bottom-nav, so a bare jumpToTab
-    // would swap the tab behind them and leave the user staring at the
-    // previous screen. Reset to the tab root first.
+    // `withNavBar: false` routes sit on the root navigator above the
+    // bottom-nav; pop them so jumpToTab is actually visible. Stop at
+    // popups so open dialogs/sheets stay alive.
     final navigator = Navigator.of(context);
     if (navigator.canPop()) {
-      navigator.popUntil((route) => route.isFirst);
+      navigator.popUntil((route) => route.isFirst || route is PopupRoute);
     }
     AppRoutes.goToTab(context, Modules.timetable);
   }
@@ -80,12 +95,11 @@ class _AppState extends State<App> with WidgetsBindingObserver {
     if (!mounted) return;
     final share = ShareIntentListener.pending.value;
     if (share == null) return;
-    // A second share arriving while a previous share-flow page is still on
-    // the stack would otherwise leave the old page sitting on top with stale
-    // (already-cleared) file paths. Reset to the tab root before pushing.
+    // A second share would otherwise leave the previous share-flow page
+    // on top with stale (already-cleared) file paths.
     final navigator = Navigator.of(context);
     if (navigator.canPop()) {
-      navigator.popUntil((route) => route.isFirst);
+      navigator.popUntil((route) => route.isFirst || route is PopupRoute);
     }
     AppRoutes.openShareTarget(context, share);
   }
@@ -101,15 +115,11 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       if (!mounted) return;
       context.read<BreakerBloc>().refresh();
       context.read<ChatListBloc>().refresh();
-      // App is freshly mounted on every login (BlocConsumer in main.dart
-      // swaps it in for Login), so this also covers the post-logout case
-      // where the bloc was reset to an empty state and needs a fresh fetch.
+      // Re-mounts on every login, so this also covers post-logout state reset.
       final timetable = context.read<TimetableBloc>();
       timetable.refresh();
-      // Push the freshest timetable state into the home-screen widget any
-      // time the BLoC reports new data — without waiting for the periodic
-      // background refresh. This is the "user just opened the app" path:
-      // the widget gets the same data the user is looking at on screen.
+      // Mirror BLoC updates into the home-screen widget without waiting
+      // for the periodic background refresh.
       final settingsCubit = context.read<SettingsCubit>();
       _timetableWidgetSync?.cancel();
       _timetableWidgetSync = timetable.stream.listen((state) {
@@ -123,8 +133,7 @@ class _AppState extends State<App> with WidgetsBindingObserver {
           );
         }
       });
-      // Also publish the current state once, in case data is already loaded
-      // from hydrated storage before the listener attaches.
+      // Initial publish in case hydrated storage already has data.
       final initialData = timetable.state.data;
       if (initialData is TimetableState) {
         unawaited(
@@ -138,28 +147,24 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       ShareIntentListener.instance.attach();
       ShareIntentListener.pending.addListener(_handlePendingShare);
       _handlePendingShare();
+      _syncChatListPolling();
     });
 
     _updateTimings = Timer.periodic(const Duration(seconds: 30), (_) {
       if (mounted) setState(() {});
     });
 
-    _refetchChats = Timer.periodic(const Duration(seconds: 60), (_) {
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (!mounted) return;
-        context.read<ChatListBloc>().refresh();
-      });
-    });
-
     UpdateUserIndex.index();
 
     if (context.read<SettingsCubit>().val().notificationSettings.enabled) {
       void update() => NotifyUpdater.registerToServer();
-      FirebaseMessaging.instance.onTokenRefresh.listen((_) => update());
+      _fcmTokenRefreshSub = FirebaseMessaging.instance.onTokenRefresh.listen(
+        (_) => update(),
+      );
       update();
     }
 
-    FirebaseMessaging.onMessage.listen((message) {
+    _onMessageSub = FirebaseMessaging.onMessage.listen((message) {
       if (!mounted) return;
       NotificationController.onForegroundMessageHandler(message, context);
     });
@@ -167,7 +172,9 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       NotificationController.onBackgroundMessageHandler,
     );
 
-    FirebaseMessaging.onMessageOpenedApp.listen((message) {
+    _onMessageOpenedAppSub = FirebaseMessaging.onMessageOpenedApp.listen((
+      message,
+    ) {
       if (!mounted) return;
       NotificationController.onAppOpenedByNotification(message, context);
     });
@@ -181,9 +188,11 @@ class _AppState extends State<App> with WidgetsBindingObserver {
 
   @override
   void dispose() {
-    _refetchChats.cancel();
     _updateTimings.cancel();
     _timetableWidgetSync?.cancel();
+    _onMessageSub?.cancel();
+    _onMessageOpenedAppSub?.cancel();
+    _fcmTokenRefreshSub?.cancel();
     ShareIntentListener.pending.removeListener(_handlePendingShare);
     ShareIntentListener.instance.detach();
     Main.bottomNavigator.removeListener(_onTabControllerChanged);
@@ -200,17 +209,9 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       final totalTabs = bottomBarModules.length + 1;
       final currentIndex = Main.bottomNavigator.index;
 
-      // The bottom-bar layout is identified by the ordered list of module
-      // names plus the trailing 'more' slot. Whenever this layout changes
-      // — slot count, reordering, or hiding a module — we recreate the
-      // entire PersistentTabView via the [layoutKey] below. The package
-      // caches per-tab navigator state by index in `_navigatorKeys`, and
-      // its internal `alignLength` only ever appends or trims at the end.
-      // So when the module sitting at e.g. index 3 changes, the navigator
-      // at that index still serves the old screen's route stack and the
-      // user sees stale content. Re-mounting clears those stacks; the
-      // trade-off (losing in-tab pushed routes on a settings change) is
-      // acceptable since the user explicitly re-shaped the bar.
+      // PersistentTabView caches per-tab navigators by index and only
+      // appends/trims at the end, so reordering/hiding leaves stale
+      // route stacks under the wrong tabs. Re-key on layout to remount.
       final layoutKey = ValueKey(
         '${bottomBarModules.map((m) => m.module.name).join('|')}|more',
       );
@@ -222,12 +223,8 @@ class _AppState extends State<App> with WidgetsBindingObserver {
         } else if (currentIndex >= totalTabs) {
           targetIndex = totalTabs - 1;
         }
-        // Re-mounting PTV with a new key constructs fresh internals from
-        // its controller's current index. If the controller still points
-        // past the new tab list, Style6BottomNavBar (and others) crash on
-        // out-of-range access during initState. Replace the controller
-        // atomically with one initialised at the safe target index so the
-        // new PTV mounts cleanly.
+        // Replace the controller atomically: a stale index past the new
+        // tab list crashes Style6BottomNavBar's initState.
         if (targetIndex != currentIndex) {
           Main.bottomNavigator.removeListener(_onTabControllerChanged);
           Main.bottomNavigator = PersistentTabController(
@@ -263,14 +260,17 @@ class _AppState extends State<App> with WidgetsBindingObserver {
           ),
         ],
         navBarBuilder: (config) => Style6BottomNavBar(
-          // Style6BottomNavBar builds its internal animation controller list
-          // in initState and never grows it on didUpdateWidget. Keying by the
-          // item count forces a fresh State whenever the slot count changes,
-          // which avoids a RangeError when more tabs slide in.
+          // Animation controllers are built once in initState and never
+          // grown — re-key on item count to avoid RangeError on growth.
           key: ValueKey(config.items.length),
           navBarConfig: config,
           navBarDecoration: NavBarDecoration(
-            border: const Border(top: BorderSide(width: 1, color: Colors.grey)),
+            border: Border(
+              top: BorderSide(
+                width: 1,
+                color: Theme.of(context).colorScheme.outlineVariant,
+              ),
+            ),
             color: Theme.of(context).colorScheme.surface,
           ),
         ),

lib/main.dart

@@ -23,6 +23,7 @@ import 'app.dart';
 import 'background/widget_background_task.dart';
 import 'firebase_options.dart';
 import 'model/account_data.dart';
+import 'routing/app_routes.dart';
 import 'share_intent/share_intent_listener.dart';
 import 'state/app/modules/account/bloc/account_bloc.dart';
 import 'state/app/modules/account/bloc/account_state.dart';
@@ -153,7 +154,9 @@ Future<void> main() async {
         ),
         BlocProvider<BreakerBloc>(create: (_) => BreakerBloc()),
         BlocProvider<ChatListBloc>(create: (_) => ChatListBloc()),
-        BlocProvider<ChatBloc>(create: (_) => ChatBloc()),
+        BlocProvider<ChatBloc>(
+          create: (ctx) => ChatBloc(chatListBloc: ctx.read<ChatListBloc>()),
+        ),
         BlocProvider<TimetableBloc>(create: (_) => TimetableBloc()),
       ],
       child: const Main(),
@@ -199,6 +202,8 @@ class _MainState extends State<Main> {
           checkerboardRasterCacheImages:
               devToolsSettings.checkerboardRasterCacheImages,
           debugShowCheckedModeBanner: false,
+          // Used by ChatView.didPopNext to reclaim the global ChatBloc.
+          navigatorObservers: [AppRoutes.chatRouteObserver],
           localizationsDelegates: const [
             ...GlobalMaterialLocalizations.delegates,
             GlobalWidgetsLocalizations.delegate,

lib/notification/notification_controller.dart

@@ -1,13 +1,19 @@
+import 'dart:async';
+
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
+import '../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../widget/debug/debug_tile.dart';
 import '../widget/debug/json_viewer.dart';
 import '../widget/info_dialog.dart';
 import 'notification_tasks.dart';
 
+// `vm:entry-point` keeps this alive through AOT tree-shaking — the FCM
+// background isolate looks the class up by name from native code.
+@pragma('vm:entry-point')
 class NotificationController {
-  // Notification display is handled by the Firebase SDK using server-generated payloads.
   @pragma('vm:entry-point')
   static Future<void> onBackgroundMessageHandler(RemoteMessage message) async {
     NotificationTasks.updateBadgeCount(message);
@@ -17,8 +23,26 @@ class NotificationController {
     RemoteMessage message,
     BuildContext context,
   ) async {
-    NotificationTasks.updateProviders(context);
+    final pushToken = _extractChatToken(message);
+    final chatBloc = context.read<ChatBloc>();
+    // hasOpenChat, not currentToken: currentToken sticks around after
+    // leaveChat so didPopNext can re-claim a stacked chat.
+    final activeToken = chatBloc.state.data?.currentToken ?? '';
+    final chatIsOpen =
+        chatBloc.hasOpenChat &&
+        pushToken != null &&
+        pushToken.isNotEmpty &&
+        pushToken == activeToken;
+
     NotificationTasks.updateBadgeCount(message);
+
+    if (chatIsOpen) {
+      // Long-poll handles the message; just dismiss any stray tray entry.
+      unawaited(NotificationTasks.clearNotificationsForChat(pushToken));
+      return;
+    }
+
+    NotificationTasks.updateProviders(context);
   }
 
   static Future<void> onAppOpenedByNotification(

lib/notification/notification_tasks.dart

@@ -1,11 +1,15 @@
+import 'dart:developer';
+
+import 'package:eraser/eraser.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_app_badge/flutter_app_badge.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../routing/app_routes.dart';
-import '../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
+import 'notification_service.dart';
 
 class NotificationTasks {
   static void updateBadgeCount(RemoteMessage notification) {
@@ -14,9 +18,43 @@ class NotificationTasks {
     );
   }
 
+  /// Per-chat tag scheme. MUST match the Notify backend, which sets this
+  /// value on `AndroidNotification.setTag` AND `apns-collapse-id`.
+  static String chatTag(String chatToken) => 'talk_$chatToken';
+
+  /// Removes tray notifications belonging to [chatToken]. Eraser handles
+  /// iOS (where the plugin's `getActiveNotifications` returns null ids
+  /// for FCM posts and can't cancel them); the local-notifications sweep
+  /// handles Android and acts as a fallback while Eraser's native side
+  /// isn't built in yet.
+  static Future<void> clearNotificationsForChat(String chatToken) async {
+    final tag = chatTag(chatToken);
+    try {
+      await Eraser.clearAppNotificationsByTag(tag);
+    } on MissingPluginException {
+      // Eraser native code not yet linked — needs flutter clean + run.
+    } on Object catch (e) {
+      log('Eraser($tag) failed: $e');
+    }
+    try {
+      final plugin = NotificationService().flutterLocalNotificationsPlugin;
+      final actives = await plugin.getActiveNotifications();
+      for (final n in actives) {
+        final id = n.id;
+        if (id == null) continue;
+        if (n.tag == tag) await plugin.cancel(id: id, tag: n.tag);
+      }
+    } on Object catch (e) {
+      log('Active-notification sweep failed: $e');
+    }
+  }
+
+  /// Refreshes the chat list. Deliberately does NOT touch [ChatBloc] —
+  /// the open chat view manages its own state via long-poll, and refreshing
+  /// it here would re-fetch the last-opened chat with setReadMarker=on
+  /// even if the user has already left.
   static void updateProviders(BuildContext context) {
     context.read<ChatListBloc>().refresh();
-    context.read<ChatBloc>().refresh();
   }
 
   /// Switches to the Talk tab. If [chatToken] is provided, also schedules

lib/routing/app_routes.dart

@@ -6,6 +6,7 @@ import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
 import '../api/marianumcloud/talk/room/get_room_response.dart';
 import '../main.dart';
 import '../model/account_data.dart';
+import '../notification/notification_tasks.dart';
 import '../share_intent/pending_share.dart';
 import '../share_intent/remote_file_ref.dart';
 import '../state/app/modules/app_modules.dart';
@@ -39,6 +40,11 @@ class AppRoutes {
   /// by `ChatList` once the matching room is loaded.
   static final ValueNotifier<String?> pendingChatToken = ValueNotifier(null);
 
+  /// Root-navigator observer used by [ChatView] to reclaim the global
+  /// [ChatBloc] on `didPopNext` after a stacked chat is popped.
+  static final RouteObserver<PageRoute<dynamic>> chatRouteObserver =
+      RouteObserver<PageRoute<dynamic>>();
+
   static void openFolder(BuildContext context, List<String> path) {
     pushScreen(context, withNavBar: false, screen: Files(path: path));
   }
@@ -177,6 +183,12 @@ class AppRoutes {
     required UserAvatar avatar,
     bool overrideToSingleSubScreen = true,
   }) {
+    // Local mark only. Server-side mark is sent later from
+    // ChatBloc._loadChat with the freshly-fetched maxId — sending one
+    // here too with the chat list's possibly-stale room.lastMessage.id
+    // would race the fresh one and could regress the server cursor.
+    context.read<ChatListBloc>().markRoomAsRead(room.token, room.lastMessage.id);
+    NotificationTasks.clearNotificationsForChat(room.token);
     TalkNavigator.pushSplitView(
       context,
       ChatView(room: room, selfId: selfId, avatar: avatar),

lib/state/app/modules/chat/bloc/chat_bloc.dart

@@ -1,15 +1,53 @@
+import 'dart:async';
+import 'dart:developer';
+import 'dart:math' as math;
+
+import 'package:flutter/widgets.dart';
+
 import '../../../../../api/errors/error_mapper.dart';
+import '../../../../../api/marianumcloud/talk/chat/get_chat_response.dart';
+import '../../../../../api/marianumcloud/talk/chat/long_poll_chat.dart';
+import '../../../../../api/marianumcloud/talk/room/get_room_response.dart';
+import '../../../../../api/marianumcloud/talk/set_read_marker/set_read_marker.dart';
+import '../../../../../api/marianumcloud/talk/set_read_marker/set_read_marker_params.dart';
 import '../../../infrastructure/loadable_state/loading_error.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc_event.dart';
+import '../../chat_list/bloc/chat_list_bloc.dart';
 import '../repository/chat_repository.dart';
 import 'chat_event.dart';
 import 'chat_state.dart';
 
 class ChatBloc
-    extends LoadableHydratedBloc<ChatEvent, ChatState, ChatRepository> {
+    extends LoadableHydratedBloc<ChatEvent, ChatState, ChatRepository>
+    with WidgetsBindingObserver {
+  final ChatListBloc? _chatListBloc;
+
+  String? _pollingToken;
+  int _backoffMs = 0;
+  int _lastKnownMessageId = 0;
+  bool _appResumed = true;
+
+  /// True only while a ChatView is mounted. Can't reuse `currentToken` —
+  /// clearing it on leaveChat races with setToken from didPopNext when
+  /// popping a stacked chat, causing spurious server read-markers on resume.
+  bool _chatViewActive = false;
+
+  bool get hasOpenChat => _chatViewActive;
+
   DateTime _lastTokenSet = DateTime.fromMillisecondsSinceEpoch(0);
 
+  ChatBloc({ChatListBloc? chatListBloc}) : _chatListBloc = chatListBloc {
+    WidgetsBinding.instance.addObserver(this);
+  }
+
+  @override
+  Future<void> close() {
+    WidgetsBinding.instance.removeObserver(this);
+    _stopLongPoll();
+    return super.close();
+  }
+
   @override
   ChatRepository repository() => ChatRepository();
 
@@ -33,24 +71,70 @@ class ChatBloc
   }
 
   void setToken(String token) {
+    _chatViewActive = true;
     if (token == (innerState?.currentToken ?? '')) {
       refresh();
       return;
     }
+    _stopLongPoll();
     add(Emit((s) => s.copyWith(currentToken: token, chatResponse: null)));
     add(RefetchStarted<ChatState>());
-    _loadChat(token);
-  }
-
-  void setReferenceMessageId(int? messageId) {
-    add(Emit((s) => s.copyWith(referenceMessageId: messageId)));
+    _scheduleLoad(token);
   }
 
   void refresh() {
     final token = innerState?.currentToken ?? '';
     if (token.isEmpty) return;
     add(RefetchStarted<ChatState>());
-    _loadChat(token);
+    _scheduleLoad(token);
+  }
+
+  void setReferenceMessageId(int? messageId) {
+    add(Emit((s) => s.copyWith(referenceMessageId: messageId)));
+  }
+
+  /// No-op when the bloc has already moved on to a different token: when
+  /// popping a stacked chat (B over A), A's didPopNext runs setToken(A)
+  /// before B's dispose fires.
+  void leaveChat(String fromToken) {
+    if ((innerState?.currentToken ?? '') != fromToken) return;
+    _chatViewActive = false;
+    _stopLongPoll();
+  }
+
+  Future<void> sendServerReadMarker(String token, int messageId) async {
+    try {
+      await SetReadMarker(
+        token,
+        true,
+        setReadMarkerParams: SetReadMarkerParams(lastReadMessage: messageId),
+      ).run();
+    } on Object catch (e) {
+      log('Server read-marker for $token failed: $e');
+    }
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    final wasResumed = _appResumed;
+    _appResumed = state == AppLifecycleState.resumed;
+    if (!_appResumed) {
+      _stopLongPoll();
+      return;
+    }
+    if (wasResumed) return;
+    final token = innerState?.currentToken ?? '';
+    if (token.isNotEmpty && _chatViewActive) refresh();
+  }
+
+  /// Microtask hop so the Bloc worker drains the preceding Emit before
+  /// any cache callback fires — a quick cache hit otherwise runs with
+  /// the previous token in state and fails stillCurrent().
+  void _scheduleLoad(String token) {
+    Future<void>.microtask(() {
+      if (isClosed) return;
+      _loadChat(token).then((_) => _startLongPoll(token));
+    });
   }
 
   Future<void> _loadChat(String token) async {
@@ -69,14 +153,25 @@ class ChatBloc
         token: token,
         onCacheData: (data) {
           if (!stillCurrent()) return;
-          // Cache hit: show data immediately but preserve lastFetch — the
-          // cached payload may be stale and we don't want the UI to claim a
-          // fresh fetch just happened.
+          // Skip cache paint over already-merged long-poll data — would
+          // visibly drop those messages until the network call resolves.
+          if (innerState?.chatResponse != null) return;
           add(Emit((s) => s.copyWith(chatResponse: data)));
         },
         onNetworkData: (data) {
+          // Mark runs even if no longer current — otherwise a quick
+          // navigation away leaves the server cursor stale. Cache check
+          // skips the POST when the cursor is already at maxId.
+          final maxId = _maxMessageId(data);
+          if (maxId > 0) {
+            final cached = _chatListBloc?.lastReadMessageFor(token);
+            if (cached == null || cached < maxId) {
+              unawaited(sendServerReadMarker(token, maxId));
+            }
+          }
           if (!stillCurrent()) return;
-          add(DataGathered((s) => s.copyWith(chatResponse: data)));
+          _applyChatResponse(data);
+          if (maxId > 0) _chatListBloc?.markRoomAsRead(token, maxId);
         },
         onError: (e) => capturedError = e,
       );
@@ -98,4 +193,106 @@ class ChatBloc
       );
     }
   }
+
+  void _startLongPoll(String token) {
+    if (!_appResumed) return;
+    if (_pollingToken == token) return;
+    _stopLongPoll();
+    _pollingToken = token;
+    _backoffMs = 0;
+    _lastKnownMessageId = _maxMessageId(innerState?.chatResponse);
+    unawaited(_pollLoop(token));
+  }
+
+  void _stopLongPoll() {
+    _pollingToken = null;
+    _backoffMs = 0;
+  }
+
+  Future<void> _pollLoop(String token) async {
+    while (_pollingToken == token && !isClosed) {
+      try {
+        final response = await LongPollChat(
+          chatToken: token,
+          lastKnownMessageId: _lastKnownMessageId,
+        ).run();
+
+        if (_pollingToken != token || isClosed) return;
+        _backoffMs = 0;
+
+        if (response == null) continue;
+
+        final headerId = int.tryParse(
+          response.headers?[_kLongPollLastGivenHeader] ?? '',
+        );
+        if (headerId != null && headerId > _lastKnownMessageId) {
+          _lastKnownMessageId = headerId;
+        }
+
+        if (response.data.isEmpty) continue;
+        _applyChatResponse(response);
+        final maxId = _maxMessageId(response);
+        if (maxId > _lastKnownMessageId) _lastKnownMessageId = maxId;
+        // Long-poll's setReadMarker=on moved the server cursor; mirror locally.
+        final preview = _pickDisplayMessage(response);
+        if (preview != null) {
+          _chatListBloc?.applyIncomingMessage(token, preview);
+        } else {
+          _chatListBloc?.markRoomAsRead(token, _lastKnownMessageId);
+        }
+      } on Object catch (e) {
+        if (_pollingToken != token || isClosed) return;
+        log('LongPoll error for $token: $e');
+        _backoffMs = _backoffMs == 0 ? 2000 : math.min(_backoffMs * 2, 30000);
+        await Future.delayed(Duration(milliseconds: _backoffMs));
+      }
+    }
+  }
+
+  /// Dedups by id with newer-wins so server edits/deletes propagate.
+  void _applyChatResponse(GetChatResponse incoming) {
+    final current = innerState?.chatResponse;
+    if (current == null) {
+      add(DataGathered((s) => s.copyWith(chatResponse: incoming)));
+      return;
+    }
+    final byId = <int, GetChatResponseObject>{};
+    for (final m in current.data) {
+      byId[m.id] = m;
+    }
+    for (final m in incoming.data) {
+      byId[m.id] = m;
+    }
+    final merged = GetChatResponse(byId.values.toSet())
+      ..headers = incoming.headers;
+    add(DataGathered((s) => s.copyWith(chatResponse: merged)));
+  }
+
+  int _maxMessageId(GetChatResponse? response) {
+    if (response == null) return 0;
+    var max = 0;
+    for (final m in response.data) {
+      if (m.id > max) max = m.id;
+    }
+    return max;
+  }
+
+  /// Mirrors the server's own `lastMessage` selection (comments + voice only).
+  GetChatResponseObject? _pickDisplayMessage(GetChatResponse response) {
+    GetChatResponseObject? best;
+    for (final m in response.data) {
+      switch (m.messageType) {
+        case GetRoomResponseObjectMessageType.comment:
+        case GetRoomResponseObjectMessageType.voiceMessage:
+          if (best == null || m.id > best.id) best = m;
+        case GetRoomResponseObjectMessageType.deletedComment:
+        case GetRoomResponseObjectMessageType.system:
+        case GetRoomResponseObjectMessageType.command:
+          break;
+      }
+    }
+    return best;
+  }
 }
+
+const _kLongPollLastGivenHeader = 'x-chat-last-given';

lib/state/app/modules/chat_list/bloc/chat_list_bloc.dart

@@ -1,8 +1,10 @@
+import 'dart:async';
 import 'dart:developer';
 
 import 'package:flutter_app_badge/flutter_app_badge.dart';
 
 import '../../../../../api/errors/error_mapper.dart';
+import '../../../../../api/marianumcloud/talk/chat/get_chat_response.dart';
 import '../../../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../infrastructure/loadable_state/loading_error.dart';
 import '../../../infrastructure/utility_widgets/loadable_hydrated_bloc/loadable_hydrated_bloc.dart';
@@ -15,6 +17,8 @@ class ChatListBloc
     extends
         LoadableHydratedBloc<ChatListEvent, ChatListState, ChatListRepository> {
   bool _forceRenew = false;
+  Timer? _autoRefreshTimer;
+  Duration? _autoRefreshInterval;
 
   @override
   void retry() {
@@ -22,6 +26,25 @@ class ChatListBloc
     super.retry();
   }
 
+  @override
+  Future<void> close() {
+    _autoRefreshTimer?.cancel();
+    return super.close();
+  }
+
+  /// Silent refresh — explicit pull-to-refresh and tab-activation are non-silent.
+  void setAutoRefreshInterval(Duration? interval) {
+    if (interval == _autoRefreshInterval) return;
+    _autoRefreshInterval = interval;
+    _autoRefreshTimer?.cancel();
+    _autoRefreshTimer = null;
+    if (interval == null) return;
+    _autoRefreshTimer = Timer.periodic(interval, (_) {
+      if (isClosed) return;
+      refresh(silent: true);
+    });
+  }
+
   @override
   ChatListRepository repository() => ChatListRepository();
 
@@ -51,8 +74,8 @@ class ChatListBloc
     if (capturedError != null) throw capturedError!;
   }
 
-  Future<void> refresh({bool renew = true}) async {
-    add(RefetchStarted<ChatListState>());
+  Future<void> refresh({bool renew = true, bool silent = false}) async {
+    if (!silent) add(RefetchStarted<ChatListState>());
     Object? capturedError;
     try {
       final rooms = await repo.data.getRooms(
@@ -82,6 +105,65 @@ class ChatListBloc
     await refresh();
   }
 
+  int? lastReadMessageFor(String token) {
+    final rooms = innerState?.rooms;
+    if (rooms == null) return null;
+    for (final room in rooms.data) {
+      if (room.token == token) return room.lastReadMessage;
+    }
+    return null;
+  }
+
+  /// Optimistic — server-side mark-as-read is the caller's job.
+  void markRoomAsRead(String token, int lastMessageId) {
+    _mutateRoom(token, (r) {
+      if (r.unreadMessages == 0 && r.lastReadMessage >= lastMessageId) {
+        return false;
+      }
+      r.unreadMessages = 0;
+      r.unreadMention = false;
+      r.unreadMentionDirect = false;
+      if (lastMessageId > r.lastReadMessage) r.lastReadMessage = lastMessageId;
+      return true;
+    });
+  }
+
+  /// Clears unread too — long-poll only feeds this in for an actively-open chat.
+  void applyIncomingMessage(String token, GetChatResponseObject message) {
+    _mutateRoom(token, (r) {
+      final wasRead =
+          r.unreadMessages == 0 && r.lastReadMessage >= message.id;
+      final hasNewer = r.lastMessage.id >= message.id;
+      if (wasRead && hasNewer) return false;
+      r.unreadMessages = 0;
+      r.unreadMention = false;
+      r.unreadMentionDirect = false;
+      if (message.id > r.lastReadMessage) r.lastReadMessage = message.id;
+      if (message.id > r.lastMessage.id) r.lastMessage = message;
+      if (message.timestamp > r.lastActivity) r.lastActivity = message.timestamp;
+      return true;
+    });
+  }
+
+  /// Re-wraps in a fresh [GetRoomResponse] so identity-based equality picks it up.
+  void _mutateRoom(
+    String token,
+    bool Function(GetRoomResponseObject room) mutator,
+  ) {
+    final rooms = innerState?.rooms;
+    if (rooms == null) return;
+    var changed = false;
+    final updated = rooms.data.map((r) {
+      if (r.token != token) return r;
+      if (mutator(r)) changed = true;
+      return r;
+    }).toSet();
+    if (!changed) return;
+    final newRooms = GetRoomResponse(updated)..headers = rooms.headers;
+    add(Emit((s) => s.copyWith(rooms: newRooms)));
+    _updateAppBadge(newRooms);
+  }
+
   void _updateAppBadge(GetRoomResponse rooms) {
     try {
       final unread = rooms.data.fold<int>(

lib/view/pages/marianum_dates/widgets/event_list_tile.dart

@@ -102,6 +102,7 @@ class MarianumDateRow extends StatelessWidget {
                   initialDescription: event.description,
                   initialStart: event.start,
                   initialEnd: event.end,
+                  initialAllDay: event.isAllDay,
                 ),
                 barrierDismissible: false,
               ),

lib/view/pages/settings/sections/about_section.dart

@@ -67,12 +67,12 @@ class AboutSection extends StatelessWidget {
       applicationIcon: const Icon(Icons.apps),
       applicationName: 'MarianumMobile',
       applicationVersion:
-          '${appInfo.appName}\n\nPackage: ${appInfo.packageName}\nVersion: ${appInfo.version}\nBuild: ${appInfo.buildNumber}',
+          '${appInfo.appName}\n\n${appInfo.packageName}\nVersion: ${appInfo.version}\nBuild/Relase-nummer: ${appInfo.buildNumber}',
       applicationLegalese:
           'Dies ist ein Inoffizieller Marianum-Cloud & Webuntis Client und wird nicht vom Marianum selbst betrieben.\n'
           'Keinerlei Gewähr für Vollständigkeit, Richtigkeit und Aktualität!\n\n'
-          "${kReleaseMode ? "Production" : "Development"} build\n"
-          'Marianum Fulda 2023-${Jiffy.now().year}\nElias Müller',
+          "${kReleaseMode ? "Production" : "Development ${kProfileMode ? "(Profiling)" : "(Debug)"}"} build.\n\n"
+          'Marianum Fulda 2019-2020, 2023-${Jiffy.now().year}\nElias Müller',
     );
   }
 
@@ -92,7 +92,7 @@ class AboutSection extends StatelessWidget {
       ),
       ListTile(
         leading: const CenteredLeading(Icon(Icons.date_range_outlined)),
-        title: const Text('Infos zu Web-/ Untis'),
+        title: const Text('Infos zu (Web) Untis'),
         subtitle: const Text('Für den Stundenplan'),
         trailing: const Icon(Icons.arrow_right),
         onTap: () => PrivacyInfo(
@@ -106,7 +106,7 @@ class AboutSection extends StatelessWidget {
           Icon(Icons.send_time_extension_outlined),
         ),
         title: const Text('Infos zu mhsl'),
-        subtitle: const Text('Für Countdowns, Marianum Message und mehr'),
+        subtitle: const Text('Für Push, Kalendertermine, Marianum Message und mehr'),
         trailing: const Icon(Icons.arrow_right),
         onTap: () => PrivacyInfo(
           providerText: 'mhsl',

lib/view/pages/talk/chat_list.dart

@@ -7,7 +7,6 @@ import '../../../notification/notify_updater.dart';
 import '../../../routing/app_routes.dart';
 import '../../../state/app/infrastructure/loadable_state/loadable_state.dart';
 import '../../../state/app/infrastructure/loadable_state/view/loadable_state_consumer.dart';
-import '../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../state/app/modules/chat_list/bloc/chat_list_state.dart';
 import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
@@ -19,15 +18,13 @@ import 'search_chat.dart';
 import 'widgets/chat_tile.dart';
 import 'widgets/split_view_placeholder.dart';
 
+// Reads from the global ChatListBloc in main.dart — re-providing a local
+// one here would shadow it and split the state in two.
 class ChatList extends StatelessWidget {
   const ChatList({super.key});
 
   @override
-  Widget build(BuildContext context) =>
-      BlocModule<ChatListBloc, LoadableState<ChatListState>>(
-        create: (_) => ChatListBloc(),
-        child: (context, bloc, _) => const _ChatListView(),
-      );
+  Widget build(BuildContext context) => const _ChatListView();
 }
 
 class _ChatListView extends StatefulWidget {
@@ -65,14 +62,6 @@ class _ChatListViewState extends State<_ChatListView> {
     final resolved = AppRoutes.resolvePendingChat(context);
     if (resolved == null) return;
     AppRoutes.pendingChatToken.value = null;
-
-    // Replace any chat already pushed on top of the chat list so a freshly
-    // tapped notification doesn't stack indefinitely on previous chats.
-    final navigator = Navigator.of(context);
-    if (navigator.canPop()) {
-      navigator.popUntil((route) => route.isFirst);
-    }
-
     AppRoutes.openChatView(
       context,
       room: resolved.room,
@@ -193,7 +182,14 @@ class _ChatListViewState extends State<_ChatListView> {
                       .talkSettings
                       .drafts
                       .containsKey(room.token);
-                  return ChatTile(data: room, hasDraft: hasDraft);
+                  // Stable key keeps element identity across re-sorts so the
+                  // inner UserAvatar reuses its cached bytes instead of
+                  // flashing on every list update.
+                  return ChatTile(
+                    key: ValueKey(room.token),
+                    data: room,
+                    hasDraft: hasDraft,
+                  );
                 }).toList(),
               );
             },

lib/view/pages/talk/chat_view.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
@@ -7,9 +8,12 @@ import 'package:scrollable_positioned_list/scrollable_positioned_list.dart';
 import '../../../api/marianumcloud/talk/chat/get_chat_response.dart';
 import '../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../extensions/date_time.dart';
+import '../../../notification/notification_tasks.dart';
+import '../../../routing/app_routes.dart';
 import '../../../state/app/infrastructure/loadable_state/view/loadable_state_consumer.dart';
 import '../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../state/app/modules/chat/bloc/chat_state.dart';
+import '../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../theming/app_theme.dart';
 import '../../../widget/clickable_app_bar.dart';
 import '../../../widget/user_avatar.dart';
@@ -36,7 +40,7 @@ class ChatView extends StatefulWidget {
   State<ChatView> createState() => _ChatViewState();
 }
 
-class _ChatViewState extends State<ChatView> {
+class _ChatViewState extends State<ChatView> with RouteAware {
   final ItemScrollController _itemScrollController = ItemScrollController();
   final TextEditingController _searchTextController = TextEditingController();
   final Map<int, int> _matchIndices = {};
@@ -48,12 +52,73 @@ class _ChatViewState extends State<ChatView> {
   GetChatResponse? _matchesComputedFor;
   String? _matchesComputedQuery;
 
+  // Captured in initState because the framework has unmounted us by the
+  // time dispose runs.
+  ChatBloc? _chatBlocRef;
+  ChatListBloc? _chatListBlocRef;
+  PageRoute<dynamic>? _subscribedRoute;
+
+  @override
+  void initState() {
+    super.initState();
+    _chatBlocRef = context.read<ChatBloc>();
+    _chatListBlocRef = context.read<ChatListBloc>();
+    NotificationTasks.clearNotificationsForChat(widget.room.token);
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    final route = ModalRoute.of(context);
+    if (route is PageRoute && route != _subscribedRoute) {
+      if (_subscribedRoute != null) {
+        AppRoutes.chatRouteObserver.unsubscribe(this);
+      }
+      AppRoutes.chatRouteObserver.subscribe(this, route);
+      _subscribedRoute = route;
+    }
+  }
+
+  @override
+  void didPopNext() {
+    super.didPopNext();
+    // A stacked chat above us was just popped (typical: notification tap
+    // opened another chat). The global ChatBloc currently points at that
+    // other chat's token, so our isReady predicate fails until we re-claim.
+    _chatBlocRef?.setToken(widget.room.token);
+  }
+
   @override
   void dispose() {
+    if (_subscribedRoute != null) {
+      AppRoutes.chatRouteObserver.unsubscribe(this);
+    }
+    _markAsReadFinal();
+    _chatBlocRef?.leaveChat(widget.room.token);
     _searchTextController.dispose();
     super.dispose();
   }
 
+  /// Defensive final mark-as-read so a back-out before the long-poll
+  /// could fire doesn't leave the room as unread. Skipped when the bloc
+  /// has already moved on to another chat — the response data there
+  /// belongs to a different room, and writing its max-id as our marker
+  /// would regress our server cursor.
+  void _markAsReadFinal() {
+    final state = _chatBlocRef?.state.data;
+    if (state == null) return;
+    if (state.currentToken != widget.room.token) return;
+    final response = state.chatResponse;
+    if (response == null) return;
+    var maxId = 0;
+    for (final m in response.data) {
+      if (m.id > maxId) maxId = m.id;
+    }
+    if (maxId == 0) return;
+    _chatListBlocRef?.markRoomAsRead(widget.room.token, maxId);
+    unawaited(_chatBlocRef!.sendServerReadMarker(widget.room.token, maxId));
+  }
+
   @override
   void didUpdateWidget(covariant ChatView oldWidget) {
     super.didUpdateWidget(oldWidget);

lib/view/pages/talk/widgets/chat_message_options_dialog.dart

@@ -30,9 +30,6 @@ RichObjectString? _attachedFile(GetChatResponseObject bubbleData) {
   return file;
 }
 
-/// Long-press / double-tap options dialog for a single chat message bubble.
-/// The hosting [ChatBubble] keeps responsibility for rendering the bubble;
-/// this file owns the modal interactions (react, reply, copy, delete, ...).
 void showChatMessageOptionsDialog(
   BuildContext context, {
   required GetRoomResponseObject chatData,
@@ -183,10 +180,12 @@ void _openOrCreateDirectChat(
   }
 
   void switchToChat(GetRoomResponseObject room) {
-    // Pop the current ChatView before swapping the global ChatBloc token —
-    // otherwise the previous group chat stays mounted in the back-stack and
-    // would render empty after a back-swipe (currentToken no longer matches).
-    Navigator.of(context).popUntil((route) => route.isFirst);
+    // Pop the previous ChatView first — otherwise it stays in the
+    // back-stack with a now-mismatched currentToken and renders empty
+    // on back-swipe. Stop at popups so an open dialog stays alive.
+    Navigator.of(
+      context,
+    ).popUntil((route) => route.isFirst || route is PopupRoute);
     AppRoutes.openChatByToken(context, room.token);
   }
 

lib/view/pages/talk/widgets/chat_tile.dart

@@ -7,9 +7,10 @@ import '../../../../api/marianumcloud/talk/actions/talk_actions.dart';
 import '../../../../api/marianumcloud/talk/chat/rich_object_string_processor.dart';
 import '../../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../../api/marianumcloud/talk/set_read_marker/set_read_marker.dart';
-import '../../../../api/marianumcloud/talk/set_read_marker/set_read_marker_params.dart';
 import '../../../../extensions/date_time.dart';
 import '../../../../model/account_data.dart';
+import '../../../../notification/notification_tasks.dart';
+import '../../../../routing/app_routes.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../../../../widget/async_action_button.dart';
@@ -17,7 +18,6 @@ import '../../../../widget/confirm_dialog.dart';
 import '../../../../widget/debug/debug_tile.dart';
 import '../../../../widget/details_bottom_sheet.dart';
 import '../../../../widget/user_avatar.dart';
-import '../chat_view.dart';
 import '../talk_navigator.dart';
 
 class ChatTile extends StatefulWidget {
@@ -61,13 +61,11 @@ class _ChatTileState extends State<ChatTile> {
   void _refreshList() => context.read<ChatListBloc>().refresh();
 
   Future<void> _setCurrentAsRead() async {
-    await SetReadMarker(
-      widget.data.token,
-      true,
-      setReadMarkerParams: SetReadMarkerParams(
-        lastReadMessage: widget.data.lastMessage.id,
-      ),
-    ).run();
+    final token = widget.data.token;
+    final lastId = widget.data.lastMessage.id;
+    context.read<ChatListBloc>().markRoomAsRead(token, lastId);
+    unawaited(NotificationTasks.clearNotificationsForChat(token));
+    await context.read<ChatBloc>().sendServerReadMarker(token, lastId);
     if (!mounted) return;
     _refreshList();
   }
@@ -154,18 +152,17 @@ class _ChatTileState extends State<ChatTile> {
           return;
         }
         if (selfUsername == null) return;
-        unawaited(_setCurrentAsRead());
-        final view = ChatView(
+        // openChatView is the single entry point for opening a chat —
+        // it handles optimistic mark-as-read, tray cleanup, push, and
+        // setToken in one place so the notification-tap path gets the
+        // same treatment as a tile tap.
+        AppRoutes.openChatView(
+          context,
           room: widget.data,
           selfId: selfUsername!,
           avatar: circleAvatar,
-        );
-        TalkNavigator.pushSplitView(
-          context,
-          view,
           overrideToSingleSubScreen: true,
         );
-        context.read<ChatBloc>().setToken(widget.data.token);
       },
       onLongPress: () {
         if (widget.disableContextActions) return;

lib/view/pages/talk/widgets/highlighted_linkify.dart

@@ -78,34 +78,53 @@ class HighlightedLinkify extends StatefulWidget {
 }
 
 class _HighlightedLinkifyState extends State<HighlightedLinkify> {
-  final List<TapGestureRecognizer> _recognizers = [];
+  // Cached per link text — search rebuilds keystroke-by-keystroke
+  // would otherwise churn allocate/dispose. Pruned via [_seenLinkKeys].
+  final Map<String, TapGestureRecognizer> _recognizers = {};
+  final Set<String> _seenLinkKeys = {};
 
   @override
   void dispose() {
-    for (final r in _recognizers) {
+    for (final r in _recognizers.values) {
       r.dispose();
     }
+    _recognizers.clear();
     super.dispose();
   }
 
+  TapGestureRecognizer _recognizerFor(LinkableElement el) {
+    final key = el.text;
+    final existing = _recognizers[key];
+    if (existing != null) {
+      // Refresh onTap so a parent rebuild's new closure is picked up.
+      existing.onTap = () => widget.onOpen?.call(el);
+      return existing;
+    }
+    final created = TapGestureRecognizer()
+      ..onTap = () => widget.onOpen?.call(el);
+    _recognizers[key] = created;
+    return created;
+  }
+
+  void _pruneUnseen() {
+    final stale = _recognizers.keys
+        .where((k) => !_seenLinkKeys.contains(k))
+        .toList(growable: false);
+    for (final k in stale) {
+      _recognizers.remove(k)?.dispose();
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
-    for (final r in _recognizers) {
-      r.dispose();
-    }
-    _recognizers.clear();
+    _seenLinkKeys.clear();
 
     final defaultStyle = widget.style ??
         Theme.of(context).textTheme.bodyMedium ??
         DefaultTextStyle.of(context).style;
-    // Start from the surrounding text style so links inherit font family,
-    // size, weight, etc., then layer the link-specific color and underline
-    // on top. (Going the other way around — link style as base — used to
-    // work because TextStyle.copyWith treats `null` as "leave unchanged",
-    // so the explicit `color: null, decoration: null` were silently
-    // ignored and the merge pulled defaultStyle's color/decoration over
-    // the blue + underline. Result: links rendered in body-text color
-    // with no underline.)
+    // Default first, link style on top — reversing the merge silently
+    // drops link color/underline because TextStyle.merge treats explicit
+    // nulls in the overlay as "leave unchanged".
     final linkStyle = defaultStyle.merge(
       widget.linkStyle ??
           const TextStyle(
@@ -124,9 +143,8 @@ class _HighlightedLinkifyState extends State<HighlightedLinkify> {
 
     for (final el in elements) {
       if (el is LinkableElement) {
-        final recognizer = TapGestureRecognizer()
-          ..onTap = () => widget.onOpen?.call(el);
-        _recognizers.add(recognizer);
+        _seenLinkKeys.add(el.text);
+        final recognizer = _recognizerFor(el);
         spans.addAll(
           buildHighlightedSpans(
             text: el.text,
@@ -147,6 +165,8 @@ class _HighlightedLinkifyState extends State<HighlightedLinkify> {
       }
     }
 
+    _pruneUnseen();
+
     return Text.rich(TextSpan(children: spans));
   }
 }

lib/view/pages/timetable/custom_events/custom_event_edit_dialog.dart

@@ -19,6 +19,7 @@ class CustomEventEditDialog extends StatefulWidget {
   final DateTime? initialEnd;
   final String? initialTitle;
   final String? initialDescription;
+  final bool? initialAllDay;
 
   const CustomEventEditDialog({
     this.existingEvent,
@@ -26,6 +27,7 @@ class CustomEventEditDialog extends StatefulWidget {
     this.initialEnd,
     this.initialTitle,
     this.initialDescription,
+    this.initialAllDay,
     super.key,
   });
 
@@ -78,12 +80,17 @@ class _CustomEventEditDialogState extends State<CustomEventEditDialog> {
       }
       return;
     }
-    _isAllDay = false;
-    final rawStart = widget.initialStart?.toTimeOfDay() ?? _defaultStart;
-    final rawEnd = widget.initialEnd?.toTimeOfDay() ?? _defaultEnd;
-    final clamped = _clampToVisibleWindow(rawStart, rawEnd);
-    _startTime = clamped.$1;
-    _endTime = clamped.$2;
+    _isAllDay = widget.initialAllDay ?? false;
+    if (_isAllDay) {
+      _startTime = _defaultStart;
+      _endTime = _defaultEnd;
+    } else {
+      final rawStart = widget.initialStart?.toTimeOfDay() ?? _defaultStart;
+      final rawEnd = widget.initialEnd?.toTimeOfDay() ?? _defaultEnd;
+      final clamped = _clampToVisibleWindow(rawStart, rawEnd);
+      _startTime = clamped.$1;
+      _endTime = clamped.$2;
+    }
   }
 
   static (TimeOfDay, TimeOfDay) _clampToVisibleWindow(

lib/view/pages/timetable/details/webuntis_lesson_sheet.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_calendar/calendar.dart';
 
@@ -11,7 +10,6 @@ import '../../../../state/app/modules/timetable/bloc/timetable_bloc.dart';
 import '../../../../state/app/modules/timetable/bloc/timetable_state.dart';
 import '../../../../widget/debug/debug_tile.dart';
 import '../../../../widget/details_bottom_sheet.dart';
-import '../../../../widget/unimplemented_dialog.dart';
 
 class WebuntisLessonSheet {
   static void show(
@@ -72,7 +70,7 @@ class WebuntisLessonSheet {
             }).toList(),
           ),
         _roomTile(context, state, lesson),
-        _teacherTile(context, lesson),
+        _teacherTile(lesson),
         if ((lesson.activityType ?? '').trim().isNotEmpty)
           ListTile(
             leading: const Icon(Icons.abc),
@@ -120,14 +118,15 @@ class WebuntisLessonSheet {
       final name = firstNonEmpty([resolved.name, r.name, '?']);
       final longname = firstNonEmpty([resolved.longName, r.longname, '']);
       final building = resolved.building.trim();
-      return LessonFormatter.formatLine(
+      final main = LessonFormatter.formatLine(
         name,
-        longname: longname,
         extra: (building.isNotEmpty && building != '?') ? building : null,
       );
+      final sub = (longname.isNotEmpty && longname != name) ? longname : null;
+      return (main: main, sub: sub);
     }).toList();
 
-    return _listTile(
+    return _listTileWithSubs(
       icon: Icons.room,
       label: lesson.ro.length == 1 ? 'Raum' : 'Räume',
       entries: entries,
@@ -135,39 +134,63 @@ class WebuntisLessonSheet {
     );
   }
 
-  static Widget _teacherTile(
-    BuildContext context,
-    GetTimetableResponseObject lesson,
-  ) {
-    final trailing = Visibility(
-      visible: !kReleaseMode,
-      child: IconButton(
-        icon: const Icon(Icons.textsms_outlined),
-        onPressed: () => UnimplementedDialog.show(context),
-      ),
-    );
-
+  static Widget _teacherTile(GetTimetableResponseObject lesson) {
     if (lesson.te.isEmpty) {
-      return ListTile(
-        leading: const Icon(Icons.person),
-        title: const Text('Lehrkraft: ?'),
-        trailing: trailing,
+      return const ListTile(
+        leading: Icon(Icons.person),
+        title: Text('Lehrkraft: ?'),
       );
     }
 
     final entries = lesson.te.map((t) {
-      final base = LessonFormatter.formatLine(
+      final main = LessonFormatter.formatLine(
         t.name.isNotEmpty ? t.name : '?',
         longname: t.longname,
       );
       final orgname = (t.orgname ?? '').trim();
-      return orgname.isEmpty ? base : '$base · ehemals $orgname';
+      return (main: main, sub: orgname.isEmpty ? null : 'ehemals $orgname');
     }).toList();
 
-    return _listTile(
+    return _listTileWithSubs(
       icon: Icons.person,
       label: lesson.te.length == 1 ? 'Lehrkraft' : 'Lehrkräfte',
       entries: entries,
+    );
+  }
+
+  static Widget _listTileWithSubs({
+    required IconData icon,
+    required String label,
+    required List<({String main, String? sub})> entries,
+    Widget? trailing,
+  }) {
+    if (entries.length == 1) {
+      final e = entries.first;
+      return ListTile(
+        leading: Icon(icon),
+        title: Text('$label: ${e.main}'),
+        subtitle: e.sub != null ? Text(e.sub!) : null,
+        trailing: trailing,
+      );
+    }
+    return ListTile(
+      leading: Icon(icon),
+      title: Text(label),
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: entries
+            .expand<Widget>(
+              (e) => [
+                Text(e.main),
+                if (e.sub != null)
+                  Padding(
+                    padding: const EdgeInsets.only(left: 12),
+                    child: Text(e.sub!),
+                  ),
+              ],
+            )
+            .toList(),
+      ),
       trailing: trailing,
     );
   }

lib/view/pages/timetable/widgets/appointment_tile.dart

@@ -37,40 +37,10 @@ class AppointmentTile extends StatelessWidget {
                 borderRadius: _radius,
                 color: color,
               ),
-              child: Column(
-                crossAxisAlignment: CrossAxisAlignment.stretch,
-                mainAxisSize: MainAxisSize.max,
-                children: [
-                  _AdaptiveTitle(
-                    text: appointment.subject,
-                    fontSize: kAppointmentTitleFontSize,
-                    minFontSize: kAppointmentTitleMinFontSize,
-                    fontWeight: FontWeight.w500,
-                  ),
-                  if (isCustom) ...[
-                    if (description.isNotEmpty)
-                      Expanded(
-                        child: Padding(
-                          padding: const EdgeInsets.only(top: 1),
-                          child: _WrappingBody(
-                            text: description,
-                            fontSize: kAppointmentBodyFontSize,
-                            lineHeight: kAppointmentBodyLineHeight,
-                          ),
-                        ),
-                      ),
-                  ] else ...[
-                    for (final line
-                        in description
-                            .split('\n')
-                            .where((p) => p.isNotEmpty)
-                            .take(2))
-                      _ScaledLine(
-                        text: line,
-                        fontSize: kAppointmentBodyFontSize,
-                      ),
-                  ],
-                ],
+              child: _TileContent(
+                title: appointment.subject,
+                description: description,
+                isCustom: isCustom,
               ),
             ),
           ),
@@ -96,6 +66,91 @@ class AppointmentTile extends StatelessWidget {
   }
 }
 
+/// Picks how many lines fit into the calendar slot's height. Title gets
+/// first dibs; if not even one minimum-size title line fits, the column
+/// collapses to keep the slot from overflowing.
+class _TileContent extends StatelessWidget {
+  final String title;
+  final String description;
+  final bool isCustom;
+
+  const _TileContent({
+    required this.title,
+    required this.description,
+    required this.isCustom,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final scaler = MediaQuery.textScalerOf(context);
+    final titleLineHeight = scaler.scale(kAppointmentTitleMinFontSize) * 1.1;
+    final bodyLineHeight = scaler.scale(kAppointmentBodyFontSize) * 1.1;
+
+    final titleWidget = _AdaptiveTitle(
+      text: title,
+      fontSize: kAppointmentTitleFontSize,
+      minFontSize: kAppointmentTitleMinFontSize,
+      fontWeight: FontWeight.w500,
+    );
+
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        final available = constraints.maxHeight;
+        // Slot too short for even one min-size title line — drop text
+        // entirely; the coloured rectangle is enough.
+        if (available < titleLineHeight) return const SizedBox.shrink();
+
+        final remaining =
+            (available - titleLineHeight).clamp(0.0, double.infinity);
+        final bodyLineCapacity = (remaining / bodyLineHeight).floor();
+
+        if (isCustom) {
+          if (description.isEmpty || bodyLineCapacity <= 0) {
+            return Column(
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              mainAxisSize: MainAxisSize.min,
+              children: [titleWidget],
+            );
+          }
+          return Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            mainAxisSize: MainAxisSize.max,
+            children: [
+              titleWidget,
+              Expanded(
+                child: Padding(
+                  padding: const EdgeInsets.only(top: 1),
+                  child: _WrappingBody(
+                    text: description,
+                    fontSize: kAppointmentBodyFontSize,
+                    lineHeight: kAppointmentBodyLineHeight,
+                  ),
+                ),
+              ),
+            ],
+          );
+        }
+
+        final maxBodyLines = bodyLineCapacity.clamp(0, 2);
+        final lines = description
+            .split('\n')
+            .where((p) => p.isNotEmpty)
+            .take(maxBodyLines)
+            .toList(growable: false);
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            titleWidget,
+            for (final line in lines)
+              _ScaledLine(text: line, fontSize: kAppointmentBodyFontSize),
+          ],
+        );
+      },
+    );
+  }
+}
+
 /// Renders the appointment title. Scales down to fit the available width via
 /// [FittedBox], but never below [minFontSize] — when even the minimum size
 /// overflows, the text is rendered at [minFontSize] with an ellipsis.

lib/widget/file_viewer.dart

@@ -26,9 +26,8 @@ class FileViewer extends StatefulWidget {
   final String path;
   final bool openExternal;
 
-  /// When set, enables the in-app actions "An Chat senden" and "In Dateien
-  /// speichern" — these need a server-side reference, not the local cache
-  /// path. Aufrufer reichen die Referenz durch (siehe AppRoutes.openFileViewer).
+  /// Enables in-app "An Chat senden" / "In Dateien speichern" — these
+  /// need a server-side reference instead of the local cache path.
   final RemoteFileRef? remoteFile;
 
   const FileViewer({
@@ -56,8 +55,6 @@ const Set<String> _imageExtensions = {
   'wbmp',
 };
 
-/// Video container formats whose playback the platform decoders (ExoPlayer
-/// on Android, AVPlayer on iOS) handle out of the box.
 const Set<String> _videoExtensions = {
   'mp4',
   'm4v',
@@ -67,9 +64,8 @@ const Set<String> _videoExtensions = {
   '3gp',
 };
 
-/// Audio formats playable through the same `video_player` pipeline. Some
-/// (ogg/opus/flac) work on Android only — iOS will surface an init error
-/// which we catch and surface as a friendly fallback.
+/// ogg/opus/flac are Android-only; iOS init errors fall through to the
+/// "format not supported" message.
 const Set<String> _audioExtensions = {
   'mp3',
   'm4a',
@@ -81,9 +77,7 @@ const Set<String> _audioExtensions = {
   'opus',
 };
 
-/// Extensions whose contents we render directly as plain text. Anything
-/// outside this list still gets a content-based fallback check (see
-/// [_looksLikeText]) so generic "what is this file" cases work too.
+/// Unknown extensions still get a content sniff via [_looksLikeText].
 const Set<String> _textExtensions = {
   'txt', 'md', 'markdown', 'rst', 'log',
   'json', 'json5', 'xml', 'yaml', 'yml', 'toml',
@@ -104,10 +98,7 @@ const Set<String> _textExtensions = {
   'srt', 'vtt',
 };
 
-/// Reads up to 8 KB and decides whether the bytes look like UTF-8 text.
-/// NUL bytes and non-decodable sequences disqualify the file. Used as a
-/// fallback for unknown extensions so plain text files without a familiar
-/// suffix still open in the in-app viewer.
+/// 8 KB sniff: NUL bytes or non-UTF-8 sequences disqualify.
 Future<bool> _looksLikeText(String path) async {
   final file = File(path);
   RandomAccessFile? raf;
@@ -126,10 +117,8 @@ Future<bool> _looksLikeText(String path) async {
   }
 }
 
-/// Workaround for a Syncfusion PDF viewer race: SfPdfViewer's internal
-/// LayoutBuilder calls `localToGlobal` during build, which asserts when an
-/// ancestor RenderTransform (from the page-push animation) is still mid-layout.
-/// We wait for the route's enter animation to complete before mounting it.
+/// SfPdfViewer asserts on `localToGlobal` if mounted during the page-push
+/// animation. Defer until the route enter animation completes.
 class _DeferredPdfViewer extends StatefulWidget {
   const _DeferredPdfViewer({required this.path});
   final String path;
@@ -189,8 +178,6 @@ class _FileViewerState extends State<FileViewer> {
         settings.val().fileViewSettings.alwaysOpenExternally ||
         widget.openExternal;
     if (openExternal) {
-      // Settings or popup explicitly chose "open externally" — fire and
-      // forget, then pop back. Same one-shot behaviour as the old viewer.
       WidgetsBinding.instance.addPostFrameCallback(
         (_) => _openExternallyAndPop(),
       );
@@ -254,7 +241,22 @@ class _FileViewerState extends State<FileViewer> {
         break;
       case FileViewingActions.save:
         try {
-          final bytes = await File(widget.path).readAsBytes();
+          final source = File(widget.path);
+          final size = await source.length();
+          // file_picker has no path/stream save API, so the whole file
+          // gets loaded into RAM. Cap big media; user falls back to share.
+          const maxBytes = 200 * 1024 * 1024;
+          if (size > maxBytes) {
+            if (!mounted) return;
+            InfoDialog.show(
+              context,
+              'Diese Datei ist zu groß (${(size / (1024 * 1024)).toStringAsFixed(0)} MB), '
+              'um direkt gespeichert zu werden. Nutze stattdessen die Teilen-Funktion.',
+              title: 'Speichern nicht möglich',
+            );
+            return;
+          }
+          final bytes = await source.readAsBytes();
           final saved = await FilePicker.saveFile(
             fileName: widget.path.split('/').last,
             bytes: bytes,
@@ -279,8 +281,6 @@ class _FileViewerState extends State<FileViewer> {
   List<_ActionDescriptor> _availableActions() => [
     _ActionDescriptor(
       action: FileViewingActions.openExternal,
-      // iOS opens the system share sheet (square-with-arrow icon), Android
-      // the standard app picker; mirror that visually and verbally.
       icon: Platform.isIOS ? Icons.ios_share : Icons.open_in_new,
       label: Platform.isIOS ? 'Extern öffnen' : 'Öffnen mit',
     ),
@@ -440,8 +440,7 @@ class _FileViewerState extends State<FileViewer> {
         }
         final payload = snapshot.data!;
         final lines = const LineSplitter().convert(payload.content);
-        // Reserve gutter width by the digit count of the highest line number,
-        // so the gutter stays stable as the user scrolls down.
+        // Stable gutter width — sized by the highest line number's digit count.
         final gutterWidth = (lines.length.toString().length * 9.0) + 16;
         return SelectionArea(
           child: Scrollbar(
@@ -545,8 +544,7 @@ class _FileViewerState extends State<FileViewer> {
     final raf = await file.open();
     try {
       final bytes = await raf.read(_textViewMaxBytes);
-      // Truncated payloads cannot be reliably re-formatted (parser will
-      // choke on the dangling tail), so they stay raw.
+      // Truncated payloads stay raw — a parser would choke on the dangling tail.
       return _TextPayload(
         content: utf8.decode(bytes, allowMalformed: true),
         truncated: true,
@@ -556,9 +554,7 @@ class _FileViewerState extends State<FileViewer> {
     }
   }
 
-  /// Re-indents JSON so dumped/minified payloads from the server are easier
-  /// to read. Falls through to the original text on parse errors so we
-  /// never destroy the user's content.
+  /// Falls through to the original text on parse errors.
   String _maybePrettify(String content, String ext) {
     if (ext != 'json') return content;
     try {
@@ -587,10 +583,6 @@ class _TextPayload {
   const _TextPayload({required this.content, required this.truncated});
 }
 
-/// Plays back a local file via `video_player`. Renders the standard Chewie
-/// controls for video files; audio files get a centered icon plus a custom
-/// transport row (slider, time, play/pause), since Chewie's chrome is
-/// designed around a video frame.
 class _MediaPlayer extends StatefulWidget {
   final String path;
   final bool isAudio;
@@ -780,10 +772,6 @@ class _AudioControls extends StatelessWidget {
   }
 }
 
-/// One row in the text viewer: line number on the left (not selectable so
-/// it never ends up in copied selections), monospace content on the right.
-/// Odd-numbered lines get a slightly tinted background so long files are
-/// easier to scan.
 class _CodeLine extends StatelessWidget {
   final int number;
   final String text;

lib/widget/user_avatar.dart

@@ -1,3 +1,4 @@
+import 'dart:collection';
 import 'dart:convert';
 import 'dart:typed_data';
 
@@ -29,15 +30,48 @@ class _AvatarPayload {
   _AvatarPayload(this.bytes, this.isSvg);
 }
 
-final Map<String, Future<_AvatarPayload?>> _avatarCache = {};
+class _AvatarCacheEntry {
+  final _AvatarPayload? payload;
+  final DateTime fetchedAt;
+  _AvatarCacheEntry(this.payload, this.fetchedAt);
+}
+
+// LRU via LinkedHashMap insertion order + remove-on-hit. TTL so
+// server-side avatar updates become visible within a session.
+const int _kAvatarCacheMax = 256;
+const Duration _kAvatarCacheTtl = Duration(minutes: 30);
+
+// Pending map dedups concurrent mounts onto a single HTTP call.
+final LinkedHashMap<String, _AvatarCacheEntry> _resolvedAvatars =
+    LinkedHashMap<String, _AvatarCacheEntry>();
+final Map<String, Future<_AvatarPayload?>> _pendingAvatars = {};
+
+_AvatarCacheEntry? _readAvatarCache(String url) {
+  final entry = _resolvedAvatars.remove(url);
+  if (entry == null) return null;
+  if (DateTime.now().difference(entry.fetchedAt) > _kAvatarCacheTtl) {
+    return null;
+  }
+  // Re-insert at the tail so it counts as most-recently-used.
+  _resolvedAvatars[url] = entry;
+  return entry;
+}
+
+void _writeAvatarCache(String url, _AvatarPayload? payload) {
+  _resolvedAvatars.remove(url);
+  _resolvedAvatars[url] = _AvatarCacheEntry(payload, DateTime.now());
+  while (_resolvedAvatars.length > _kAvatarCacheMax) {
+    _resolvedAvatars.remove(_resolvedAvatars.keys.first);
+  }
+}
 
 class _UserAvatarState extends State<UserAvatar> {
-  late Future<_AvatarPayload?> _payload;
+  _AvatarPayload? _payload;
 
   @override
   void initState() {
     super.initState();
-    _payload = _load();
+    _attach();
   }
 
   @override
@@ -46,7 +80,7 @@ class _UserAvatarState extends State<UserAvatar> {
     if (oldWidget.id != widget.id ||
         oldWidget.isGroup != widget.isGroup ||
         oldWidget.size != widget.size) {
-      _payload = _load();
+      _attach();
     }
   }
 
@@ -58,9 +92,21 @@ class _UserAvatarState extends State<UserAvatar> {
     return 'https://$host/avatar/${widget.id}/${widget.size}';
   }
 
-  Future<_AvatarPayload?> _load() {
+  void _attach() {
     final url = _url();
-    return _avatarCache.putIfAbsent(url, () => _fetch(url));
+    final cached = _readAvatarCache(url);
+    if (cached != null) {
+      _payload = cached.payload;
+      return;
+    }
+    _payload = null;
+    final pending = _pendingAvatars.putIfAbsent(url, () => _fetch(url));
+    pending.then((p) {
+      _writeAvatarCache(url, p);
+      _pendingAvatars.remove(url);
+      if (!mounted || _url() != url) return;
+      setState(() => _payload = p);
+    });
   }
 
   Future<_AvatarPayload?> _fetch(String url) async {
@@ -97,49 +143,45 @@ class _UserAvatarState extends State<UserAvatar> {
   Widget build(BuildContext context) {
     final radius = widget.size.toDouble();
     final theme = Theme.of(context);
+    final payload = _payload;
 
-    return FutureBuilder<_AvatarPayload?>(
-      future: _payload,
-      builder: (context, snapshot) {
-        final payload = snapshot.data;
-
-        Widget content;
-        if (payload == null) {
-          content = Icon(
-            widget.isGroup ? Icons.group : Icons.person,
-            size: radius,
-            color: Colors.white,
-          );
-        } else if (payload.isSvg) {
-          content = SvgPicture.memory(
-            payload.bytes,
-            width: radius * 2,
-            height: radius * 2,
-            fit: BoxFit.cover,
-          );
-        } else {
-          content = Image.memory(
-            payload.bytes,
-            width: radius * 2,
-            height: radius * 2,
-            fit: BoxFit.cover,
-            gaplessPlayback: true,
-          );
-        }
-
-        return CircleAvatar(
-          radius: radius,
-          backgroundColor: theme.primaryColor,
-          foregroundColor: Colors.white,
-          child: ClipOval(
-            child: SizedBox(
-              width: radius * 2,
-              height: radius * 2,
-              child: content,
-            ),
-          ),
+    Widget content;
+    if (payload != null) {
+      if (payload.isSvg) {
+        content = SvgPicture.memory(
+          payload.bytes,
+          width: radius * 2,
+          height: radius * 2,
+          fit: BoxFit.cover,
         );
-      },
+      } else {
+        content = Image.memory(
+          payload.bytes,
+          width: radius * 2,
+          height: radius * 2,
+          fit: BoxFit.cover,
+          gaplessPlayback: true,
+        );
+      }
+    } else {
+      content = Icon(
+        widget.isGroup ? Icons.group : Icons.person,
+        size: radius,
+        color: Colors.white,
+      );
+    }
+
+    return CircleAvatar(
+      radius: radius,
+      backgroundColor: theme.primaryColor,
+      foregroundColor: Colors.white,
+      child: ClipOval(
+        child: SizedBox(
+          width: radius * 2,
+          height: radius * 2,
+          child: content,
+        ),
+      ),
     );
   }
 }

pubspec.yaml

@@ -40,6 +40,11 @@ dependencies:
   flutter_linkify: ^6.0.0
   linkify: ^5.0.0
   flutter_local_notifications: ^21.0.0
+  # Cancels FCM-rendered notifications by their server-set tag
+  # (Android NotificationManager.cancel, iOS removeDeliveredNotifications via
+  # apns-collapse-id). Used to dismiss a chat's notification when the user
+  # opens or marks the chat read.
+  eraser: ^3.0.0
   scrollable_positioned_list: ^0.3.8
   flutter_split_view: ^0.1.2
   flutter_svg: ^2.0.10