fixed sliver app bar title opacity

lib/widgets/collection/app_bar.dart

@@ -20,6 +20,7 @@ import 'package:aves/widgets/common/app_bar_subtitle.dart';
 import 'package:aves/widgets/common/app_bar_title.dart';
 import 'package:aves/widgets/common/basic/menu.dart';
 import 'package:aves/widgets/common/extensions/build_context.dart';
+import 'package:aves/widgets/common/sliver_app_bar_title.dart';
 import 'package:aves/widgets/dialogs/tile_view_dialog.dart';
 import 'package:aves/widgets/search/search_delegate.dart';
 import 'package:flutter/material.dart';
@@ -116,7 +117,9 @@ class _CollectionAppBarState extends State<CollectionAppBar> with SingleTickerPr
               builder: (context, queryEnabled, child) {
                 return SliverAppBar(
                   leading: appMode.hasDrawer ? _buildAppBarLeading(isSelecting) : null,
-                  title: _buildAppBarTitle(isSelecting),
+                  title: SliverAppBarTitleWrapper(
+                    child: _buildAppBarTitle(isSelecting),
+                  ),
                   actions: _buildActions(
                     isSelecting: isSelecting,
                     selectedItemCount: selectedItemCount,
@@ -177,7 +180,7 @@ class _CollectionAppBarState extends State<CollectionAppBar> with SingleTickerPr
     );
   }
 
-  Widget? _buildAppBarTitle(bool isSelecting) {
+  Widget _buildAppBarTitle(bool isSelecting) {
     final l10n = context.l10n;
 
     if (isSelecting) {

lib/widgets/common/sliver_app_bar_title.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+// as of Flutter v2.8.1, fading opacity in `SliverAppBar`
+// is not applied to title when `appBarTheme.titleTextStyle` is defined,
+// so this wrapper manually applies opacity to the default text style
+class SliverAppBarTitleWrapper extends StatelessWidget {
+  final Widget child;
+
+  const SliverAppBarTitleWrapper({
+    Key? key,
+    required this.child,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final toolbarOpacity = context.dependOnInheritedWidgetOfExactType<FlexibleSpaceBarSettings>()!.toolbarOpacity;
+    final baseColor = (DefaultTextStyle.of(context).style.color ?? Theme.of(context).primaryTextTheme.headline6!.color!);
+    return DefaultTextStyle.merge(
+      style: TextStyle(color: baseColor.withOpacity(toolbarOpacity)),
+      child: child,
+    );
+  }
+}

lib/widgets/filter_grids/album_pick.dart

@@ -16,6 +16,7 @@ import 'package:aves/widgets/common/extensions/build_context.dart';
 import 'package:aves/widgets/common/identity/aves_filter_chip.dart';
 import 'package:aves/widgets/common/identity/empty.dart';
 import 'package:aves/widgets/common/providers/selection_provider.dart';
+import 'package:aves/widgets/common/sliver_app_bar_title.dart';
 import 'package:aves/widgets/dialogs/filter_editors/create_album_dialog.dart';
 import 'package:aves/widgets/filter_grids/albums_page.dart';
 import 'package:aves/widgets/filter_grids/common/action_delegates/album_set.dart';
@@ -141,9 +142,11 @@ class _AlbumPickAppBar extends StatelessWidget {
 
     return SliverAppBar(
       leading: const BackButton(),
-      title: SourceStateAwareAppBarTitle(
-        title: Text(title()),
-        source: source,
+      title: SliverAppBarTitleWrapper(
+        child: SourceStateAwareAppBarTitle(
+          title: Text(title()),
+          source: source,
+        ),
       ),
       bottom: _AlbumQueryBar(
         queryNotifier: queryNotifier,

lib/widgets/filter_grids/common/app_bar.dart

@@ -8,6 +8,7 @@ import 'package:aves/widgets/common/app_bar_subtitle.dart';
 import 'package:aves/widgets/common/app_bar_title.dart';
 import 'package:aves/widgets/common/basic/menu.dart';
 import 'package:aves/widgets/common/extensions/build_context.dart';
+import 'package:aves/widgets/common/sliver_app_bar_title.dart';
 import 'package:aves/widgets/filter_grids/common/action_delegates/chip_set.dart';
 import 'package:aves/widgets/search/search_delegate.dart';
 import 'package:flutter/material.dart';
@@ -74,7 +75,9 @@ class _FilterGridAppBarState<T extends CollectionFilter> extends State<FilterGri
     _isSelectingNotifier.value = isSelecting;
     return SliverAppBar(
       leading: appMode.hasDrawer ? _buildAppBarLeading(isSelecting) : null,
-      title: _buildAppBarTitle(isSelecting),
+      title: SliverAppBarTitleWrapper(
+        child: _buildAppBarTitle(isSelecting),
+      ),
       actions: _buildActions(appMode, selection),
       titleSpacing: 0,
       floating: true,
@@ -103,7 +106,7 @@ class _FilterGridAppBarState<T extends CollectionFilter> extends State<FilterGri
     );
   }
 
-  Widget? _buildAppBarTitle(bool isSelecting) {
+  Widget _buildAppBarTitle(bool isSelecting) {
     if (isSelecting) {
       return Selector<Selection<FilterGridItem<T>>, int>(
         selector: (context, selection) => selection.selectedItems.length,

lib/widgets/viewer/info/info_app_bar.dart

@@ -5,6 +5,7 @@ import 'package:aves/theme/icons.dart';
 import 'package:aves/widgets/common/app_bar_title.dart';
 import 'package:aves/widgets/common/basic/menu.dart';
 import 'package:aves/widgets/common/extensions/build_context.dart';
+import 'package:aves/widgets/common/sliver_app_bar_title.dart';
 import 'package:aves/widgets/viewer/action/entry_info_action_delegate.dart';
 import 'package:aves/widgets/viewer/info/info_search.dart';
 import 'package:aves/widgets/viewer/info/metadata/metadata_section.dart';
@@ -37,9 +38,11 @@ class InfoAppBar extends StatelessWidget {
         onPressed: onBackPressed,
         tooltip: context.l10n.viewerInfoBackToViewerTooltip,
       ),
-      title: InteractiveAppBarTitle(
-        onTap: () => _goToSearch(context),
-        child: Text(context.l10n.viewerInfoPageTitle),
+      title: SliverAppBarTitleWrapper(
+        child: InteractiveAppBarTitle(
+          onTap: () => _goToSearch(context),
+          child: Text(context.l10n.viewerInfoPageTitle),
+        ),
       ),
       actions: [
         IconButton(