Fix not grouping by month when zoomed out to the lowest level

app/lib/widget/home_photos/bloc.dart

@@ -38,6 +38,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     on<_SetEnableMemoryCollection>(_onSetEnableMemoryCollection);
     on<_SetSortByName>(_onSetSortByName);
     on<_SetMemoriesRange>(_onSetMemoriesRange);
+    on<_UpdateDateTimeGroup>(_onUpdateDateTimeGroup);
 
     on<_SetError>(_onSetError);
 
@@ -236,18 +237,22 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
       return;
     }
     final int newZoom;
+    final currZoom = state.zoom;
     if (state.scale! >= 1.25) {
       // scale up
-      newZoom = (state.zoom + 1).clamp(-1, 2);
+      newZoom = (currZoom + 1).clamp(-1, 2);
     } else if (state.scale! <= 0.75) {
-      newZoom = (state.zoom - 1).clamp(-1, 2);
+      newZoom = (currZoom - 1).clamp(-1, 2);
     } else {
-      newZoom = state.zoom;
+      newZoom = currZoom;
     }
     emit(state.copyWith(
       zoom: newZoom,
       scale: null,
     ));
+    if ((currZoom >= 0) != (newZoom >= 0)) {
+      add(const _UpdateDateTimeGroup());
+    }
     unawaited(prefController.setHomePhotosZoomLevel(newZoom));
   }
 
@@ -272,6 +277,11 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     _transformItems(state.files);
   }
 
+  void _onUpdateDateTimeGroup(_UpdateDateTimeGroup ev, Emitter<_State> emit) {
+    _log.info(ev);
+    _transformItems(state.files);
+  }
+
   void _onSetError(_SetError ev, Emitter<_State> emit) {
     _log.info(ev);
     emit(state.copyWith(error: ExceptionEvent(ev.error, ev.stackTrace)));
@@ -286,6 +296,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
         sort: prefController.isPhotosTabSortByName.value
             ? _ItemSort.filename
             : _ItemSort.dateTime,
+        isGroupByDay: prefController.homePhotosZoomLevel.value >= 0,
         memoriesDayRange: prefController.memoriesRange.value,
         locale: language_util.getSelectedLocale() ??
             PlatformDispatcher.instance.locale,
@@ -349,7 +360,7 @@ _ItemTransformerResult _buildItem(_ItemTransformerArgument arg) {
   final sortedFiles =
       arg.files.where((f) => f.fdIsArchived != true).sorted(sorter);
   final dateHelper = arg.sort == _ItemSort.dateTime
-      ? photo_list_util.DateGroupHelper(isMonthOnly: false)
+      ? photo_list_util.DateGroupHelper(isMonthOnly: !arg.isGroupByDay)
       : null;
   final today = clock.now();
   final memoryCollectionHelper = arg.sort == _ItemSort.dateTime
@@ -369,7 +380,7 @@ _ItemTransformerResult _buildItem(_ItemTransformerArgument arg) {
     }
     final date = dateHelper?.onFile(file);
     if (date != null) {
-      transformed.add(_DateItem(date: date));
+      transformed.add(_DateItem(date: date, isMonthOnly: !arg.isGroupByDay));
     }
     transformed.add(item);
     memoryCollectionHelper?.addFile(file);

app/lib/widget/home_photos/state_event.dart

@@ -238,6 +238,14 @@ class _SetMemoriesRange implements _Event {
   final int value;
 }
 
+@toString
+class _UpdateDateTimeGroup implements _Event {
+  const _UpdateDateTimeGroup();
+
+  @override
+  String toString() => _$toString();
+}
+
 @toString
 class _SetError implements _Event {
   const _SetError(this.error, [this.stackTrace]);

app/lib/widget/home_photos/type.dart

@@ -76,6 +76,7 @@ class _VideoItem extends _FileItem {
 class _DateItem extends _Item {
   const _DateItem({
     required this.date,
+    required this.isMonthOnly,
   });
 
   @override
@@ -88,10 +89,12 @@ class _DateItem extends _Item {
   Widget buildWidget(BuildContext context) {
     return PhotoListDate(
       date: date,
+      isMonthOnly: isMonthOnly,
     );
   }
 
   final DateTime date;
+  final bool isMonthOnly;
 }
 
 enum _ItemSort { dateTime, filename }
@@ -101,6 +104,7 @@ class _ItemTransformerArgument {
     required this.account,
     required this.files,
     required this.sort,
+    required this.isGroupByDay,
     required this.memoriesDayRange,
     required this.locale,
   });
@@ -108,6 +112,7 @@ class _ItemTransformerArgument {
   final Account account;
   final List<FileDescriptor> files;
   final _ItemSort sort;
+  final bool isGroupByDay;
   final int memoriesDayRange;
   final Locale locale;
 }

app/lib/widget/home_photos2.g.dart

@@ -273,6 +273,13 @@ extension _$_SetMemoriesRangeToString on _SetMemoriesRange {
   }
 }
 
+extension _$_UpdateDateTimeGroupToString on _UpdateDateTimeGroup {
+  String _$toString() {
+    // ignore: unnecessary_string_interpolations
+    return "_UpdateDateTimeGroup {}";
+  }
+}
+
 extension _$_SetErrorToString on _SetError {
   String _$toString() {
     // ignore: unnecessary_string_interpolations