improved performance and battery usage on older devices

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

@@ -7,10 +7,10 @@ import '../../../../extensions/date_time.dart';
 import '../../../../state/app/modules/capabilities/bloc/capabilities_cubit.dart';
 import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../../state/app/modules/timetable/bloc/timetable_state.dart';
-import '../../../../storage/timetable_settings.dart';
 import '../data/arbitrary_appointment.dart';
 import '../data/lesson_period_schedule.dart';
 import '../data/timetable_appointment_factory.dart';
+import '../data/timetable_name_mode.dart';
 import 'custom_workweek_calendar.dart';
 import 'special_regions_builder.dart';
 
@@ -51,9 +51,10 @@ class TimetableCalendarViewState extends State<TimetableCalendarView> {
       GlobalKey<CustomWorkWeekCalendarState>();
 
   List<Appointment>? _cachedAppointments;
-  // TimetableSettings and List define no `==`, so record equality degrades to
-  // the same identity checks the cache always used.
-  (int, TimetableSettings, List<CustomTimetableEvent>, bool)? _cacheKey;
+  // Settings are keyed by the values the factory reads: the settings object is
+  // re-created on every settings write, so its identity would miss the cache
+  // for unrelated changes. The event list has no `==` and compares by identity.
+  (int, bool, TimetableNameMode, List<CustomTimetableEvent>, bool)? _cacheKey;
 
   // Stable identities let the calendar reuse its per-week pages across
   // rebuilds; rebuilding these every frame would invalidate that cache.
@@ -71,13 +72,16 @@ class TimetableCalendarViewState extends State<TimetableCalendarView> {
   }
 
   List<Appointment> _appointments(TimetableState state) {
-    final timetableSettings = context
-        .watch<SettingsCubit>()
-        .val()
-        .timetableSettings;
+    final (connectDoubleLessons, nameMode) = context.select(
+      (SettingsCubit c) => (
+        c.state.timetableSettings.connectDoubleLessons,
+        c.state.timetableSettings.timetableNameMode,
+      ),
+    );
     final key = (
       state.dataVersion,
-      timetableSettings,
+      connectDoubleLessons,
+      nameMode,
       widget.customEvents,
       widget.showClassInsteadOfTeacher,
     );
@@ -91,7 +95,7 @@ class TimetableCalendarViewState extends State<TimetableCalendarView> {
       customEvents: widget.customEvents,
       subjects: state.subjects?.result ?? const [],
       holidays: state.schoolHolidays?.result ?? const [],
-      settings: timetableSettings,
+      settings: context.read<SettingsCubit>().val().timetableSettings,
       now: DateTime.now(),
       showClassInsteadOfTeacher: widget.showClassInsteadOfTeacher,
     ).build();