loading state and error handling refactor

lib/view/pages/timetable/timetable.dart

@@ -8,6 +8,7 @@ import '../../../state/app/infrastructure/loadableState/view/loadable_state_cons
 import '../../../state/app/modules/timetable/bloc/timetable_bloc.dart';
 import '../../../state/app/modules/timetable/bloc/timetable_state.dart';
 import '../../../state/app/modules/settings/bloc/settings_cubit.dart';
+import '../../../storage/timetable_settings.dart';
 import 'custom_events/custom_event_edit_dialog.dart';
 import 'data/arbitrary_appointment.dart';
 import 'data/lesson_period_schedule.dart';
@@ -30,6 +31,7 @@ class _TimetableState extends State<Timetable> {
 
   List<Appointment>? _cachedAppointments;
   int? _lastDataVersion;
+  TimetableSettings? _lastTimetableSettings;
 
   DateTime _initialDisplayDate() => DateTime.now().add(const Duration(days: 2));
 
@@ -51,18 +53,21 @@ class _TimetableState extends State<Timetable> {
   }
 
   List<Appointment> _appointments(TimetableState state) {
-    if (_cachedAppointments != null && _lastDataVersion == state.dataVersion) {
+    final timetableSettings = context.watch<SettingsCubit>().val().timetableSettings;
+    if (_cachedAppointments != null &&
+        _lastDataVersion == state.dataVersion &&
+        identical(_lastTimetableSettings, timetableSettings)) {
       return _cachedAppointments!;
     }
     _lastDataVersion = state.dataVersion;
+    _lastTimetableSettings = timetableSettings;
 
-    final settings = context.read<SettingsCubit>();
     return _cachedAppointments = TimetableAppointmentFactory(
       lessons: state.getAllKnownLessons().toList(),
       customEvents: state.customEvents?.events ?? const [],
       rooms: state.rooms!,
       subjects: state.subjects!,
-      settings: settings.val().timetableSettings,
+      settings: timetableSettings,
       now: DateTime.now(),
     ).build();
   }