drawer: hide favourites tile if filter is hidden

lib/model/filters/favourite.dart

@@ -8,7 +8,9 @@ import 'package:flutter/widgets.dart';
 class FavouriteFilter extends CollectionFilter {
   static const type = 'favourite';
 
-  const FavouriteFilter();
+  static const instance = FavouriteFilter._private();
+
+  const FavouriteFilter._private();
 
   @override
   Map<String, dynamic> toMap() => {

lib/model/filters/filters.dart

@@ -31,7 +31,7 @@ abstract class CollectionFilter implements Comparable<CollectionFilter> {
       case AlbumFilter.type:
         return AlbumFilter.fromMap(jsonMap);
       case FavouriteFilter.type:
-        return FavouriteFilter();
+        return FavouriteFilter.instance;
       case LocationFilter.type:
         return LocationFilter.fromMap(jsonMap);
       case TypeFilter.type:

lib/widgets/drawer/app_drawer.dart

@@ -47,11 +47,12 @@ class _AppDrawerState extends State<AppDrawer> {
   Widget build(BuildContext context) {
     final hiddenFilters = settings.hiddenFilters;
     final showVideos = !hiddenFilters.contains(MimeFilter.video);
+    final showFavourites = !hiddenFilters.contains(FavouriteFilter.instance);
     final drawerItems = <Widget>[
       _buildHeader(context),
       allCollectionTile,
       if (showVideos) videoTile,
-      favouriteTile,
+      if (showFavourites) favouriteTile,
       _buildSpecialAlbumSection(),
       Divider(),
       albumListTile,
@@ -161,7 +162,7 @@ class _AppDrawerState extends State<AppDrawer> {
   Widget get favouriteTile => CollectionNavTile(
         leading: Icon(AIcons.favourite),
         title: context.l10n.drawerCollectionFavourites,
-        filter: FavouriteFilter(),
+        filter: FavouriteFilter.instance,
       );
 
   Widget get albumListTile => NavTile(

lib/widgets/search/search_delegate.dart

@@ -30,7 +30,7 @@ class CollectionSearchDelegate {
 
   static const searchHistoryCount = 10;
   static final typeFilters = [
-    FavouriteFilter(),
+    FavouriteFilter.instance,
     MimeFilter.image,
     MimeFilter.video,
     TypeFilter.animated,

lib/widgets/viewer/info/basic_section.dart

@@ -90,7 +90,7 @@ class BasicSection extends StatelessWidget {
       builder: (context, child) {
         final effectiveFilters = [
           ...filters,
-          if (entry.isFavourite) FavouriteFilter(),
+          if (entry.isFavourite) FavouriteFilter.instance,
         ]..sort();
         if (effectiveFilters.isEmpty) return SizedBox.shrink();
         return Padding(

test/model/filters_test.dart

@@ -15,7 +15,7 @@ void main() {
     final album = AlbumFilter('path/to/album', 'album');
     expect(album, jsonRoundTrip(album));
 
-    final fav = FavouriteFilter();
+    final fav = FavouriteFilter.instance;
     expect(fav, jsonRoundTrip(fav));
 
     final location = LocationFilter(LocationLevel.country, 'France${LocationFilter.locationSeparator}FR');