When adding a favorite, also add the update time.

lib/foundation/favorites.dart

@@ -462,7 +462,8 @@ class LocalFavoritesManager with ChangeNotifier {
 
   /// add comic to a folder.
   /// return true if success, false if already exists
-  bool addComic(String folder, FavoriteItem comic, [int? order]) {
+  bool addComic(String folder, FavoriteItem comic,
+      [int? order, String? updateTime]) {
     _modifiedAfterLastCache = true;
     if (!existsFolder(folder)) {
       throw Exception("Folder does not exists");
@@ -501,6 +502,18 @@ class LocalFavoritesManager with ChangeNotifier {
         values (?, ?, ?, ?, ?, ?, ?, ?, ?);
       """, [...params, minValue(folder) - 1]);
     }
+    if (updateTime != null) {
+      var columns = _db.select("""
+      pragma table_info("$folder");
+    """);
+      if (columns.any((element) => element["name"] == "last_update_time")) {
+        _db.execute("""
+          update "$folder"
+          set last_update_time = ?
+          where id == ? and type == ?;
+        """, [updateTime, comic.id, comic.type.value]);
+      }
+    }
     notifyListeners();
     return true;
   }

lib/pages/comic_details_page/actions.dart

@@ -61,6 +61,7 @@ abstract mixin class _ComicPageActions {
           update();
         },
         favoriteItem: _toFavoriteItem(),
+        updateTime: comic.findUpdateTime(),
       ),
     );
   }
@@ -73,6 +74,8 @@ abstract mixin class _ComicPageActions {
     LocalFavoritesManager().addComic(
       folder,
       _toFavoriteItem(),
+      null,
+      comic.findUpdateTime(),
     );
     isAddToLocalFav = true;
     update();

lib/pages/comic_details_page/favorite.dart

@@ -7,6 +7,7 @@ class _FavoritePanel extends StatefulWidget {
     required this.isFavorite,
     required this.onFavorite,
     required this.favoriteItem,
+    this.updateTime,
   });
 
   final String cid;
@@ -22,6 +23,8 @@ class _FavoritePanel extends StatefulWidget {
 
   final FavoriteItem favoriteItem;
 
+  final String? updateTime;
+
   @override
   State<_FavoritePanel> createState() => _FavoritePanelState();
 }
@@ -190,7 +193,12 @@ class _FavoritePanelState extends State<_FavoritePanel>
                 widget.onFavorite(false, null);
               } else {
                 for (var folder in selectedLocalFolders) {
-                  LocalFavoritesManager().addComic(folder, widget.favoriteItem);
+                  LocalFavoritesManager().addComic(
+                    folder,
+                    widget.favoriteItem,
+                    null,
+                    widget.updateTime,
+                  );
                 }
                 widget.onFavorite(true, null);
               }