minor changes

lib/model/actions/entry_actions.dart

@@ -52,7 +52,7 @@ extension ExtraEntryAction on EntryAction {
       // in app actions
       case EntryAction.toggleFavourite:
         // different data depending on toggle state
-        return null;
+        return context.l10n.entryActionAddFavourite;
       case EntryAction.delete:
         return context.l10n.entryActionDelete;
       case EntryAction.export:
@@ -93,7 +93,7 @@ extension ExtraEntryAction on EntryAction {
       // in app actions
       case EntryAction.toggleFavourite:
         // different data depending on toggle state
-        return null;
+        return AIcons.favourite;
       case EntryAction.delete:
         return AIcons.delete;
       case EntryAction.export:

lib/services/app_shortcut_service.dart

@@ -44,7 +44,7 @@ class AppShortcutService {
       await platform.invokeMethod('pin', <String, dynamic>{
         'label': label,
         'iconBytes': iconBytes,
-        'filters': filters.map((filter) => filter.toJson()).toList(),
+        'filters': filters.where((filter) => filter != null).map((filter) => filter.toJson()).toList(),
       });
     } on PlatformException catch (e) {
       debugPrint('pin failed with code=${e.code}, exception=${e.message}, details=${e.details}');

lib/widgets/collection/app_bar.dart

@@ -367,7 +367,7 @@ class _CollectionAppBarState extends State<CollectionAppBar> with SingleTickerPr
 
     if (name == null || name.isEmpty) return;
 
-    unawaited(AppShortcutService.pin(name, coverEntry, collection.filters));
+    unawaited(AppShortcutService.pin(name, coverEntry, filters));
   }
 
   void _goToSearch() {

lib/widgets/viewer/overlay/common.dart

@@ -10,10 +10,9 @@ class OverlayButton extends StatelessWidget {
 
   const OverlayButton({
     Key key,
-    @required this.scale,
+    this.scale = kAlwaysCompleteAnimation,
     @required this.child,
-  })  : assert(scale != null),
-        super(key: key);
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/widgets/viewer/panorama_page.dart

@@ -94,7 +94,6 @@ class _PanoramaPageState extends State<PanoramaPage> {
                             return Padding(
                               padding: EdgeInsets.all(8) + EdgeInsets.only(right: mqPadding.right, bottom: mqPadding.bottom),
                               child: OverlayButton(
-                                scale: kAlwaysCompleteAnimation,
                                 child: ValueListenableBuilder<SensorControl>(
                                     valueListenable: _sensorControl,
                                     builder: (context, sensorControl, child) {