Add support to change title

lib/galleries.dart

@@ -92,6 +92,7 @@ class _GalleriesPage extends State<GalleriesPage> with ThemeModeWidget {
       ],
       leadingIcon: const Icon(Icons.sort),
     );
+    setCurrentTitle(AppLocalizations.of(context)!.galleries);
     return Scaffold(
         appBar: AppBar(
             leading: IconButton(

lib/gallery.dart

@@ -63,11 +63,13 @@ class _GalleryPage extends State<GalleryPage> with ThemeModeWidget {
     tryInitApi(context);
     final isLoading = _data == null && _error == null;
     if (isLoading && !_isLoading) _fetchData();
+    final i18n = AppLocalizations.of(context)!;
     final title = isLoading
-        ? AppLocalizations.of(context)!.loading
+        ? i18n.loading
         : _data != null
-            ? ""
-            : AppLocalizations.of(context)!.gallery;
+            ? _data!.meta.preferredTitle
+            : i18n.gallery;
+    setCurrentTitle(title, includePrefix: false);
     return Scaffold(
         appBar: _data == null
             ? AppBar(

lib/globals.dart

@@ -6,12 +6,15 @@ import 'package:event_listener/event_listener.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:flutter/services.dart'
+    show ApplicationSwitcherDescription, SystemChrome;
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:go_router/go_router.dart';
 import 'package:logging/logging.dart';
 import 'package:path/path.dart' as path;
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:window_manager/window_manager.dart';
 import 'api/client.dart';
 import 'auth.dart';
 import 'config/base.dart';
@@ -278,3 +281,35 @@ void checkAuth(BuildContext context) {
     });
   }
 }
+
+String? _currentTitle;
+String? _prefix;
+final _titleLog = Logger("Title");
+
+void setCurrentTitle(String title,
+    {bool isPrefix = false, bool includePrefix = true, bool usePrefix = false}) {
+  if (!isPrefix && includePrefix && _prefix != null) {
+    title = "$_prefix - $title";
+  }
+  if (usePrefix && _prefix != null) {
+    title = _prefix!;
+  }
+  if (_currentTitle != null && title == _currentTitle) return;
+  if (isDesktop) {
+    windowManager.setTitle(title).then((_) {
+      _currentTitle = title;
+      if (isPrefix) _prefix = title;
+    }).catchError((err) {
+      _titleLog.warning("Failed to set title:", err);
+    });
+  } else {
+    SystemChrome.setApplicationSwitcherDescription(
+            ApplicationSwitcherDescription(label: title))
+        .then((_) {
+      _currentTitle = title;
+      if (isPrefix) _prefix = title;
+    }).catchError((err) {
+      _titleLog.warning("Failed to set title:", err);
+    });
+  }
+}

lib/home.dart

@@ -17,6 +17,7 @@ class HomePage extends HookWidget {
   Widget build(BuildContext context) {
     tryInitApi(context);
     var mode = useState(MainApp.of(context).themeMode);
+    setCurrentTitle("", usePrefix: true);
     return Scaffold(
       appBar: AppBar(
         title: Text(AppLocalizations.of(context)!.titleBar),

lib/main.dart

@@ -169,9 +169,7 @@ class _MainApp extends State<MainApp> {
       routerConfig: _router,
       onGenerateTitle: (context) {
         final title = AppLocalizations.of(context)!.title;
-        if (isDesktop) {
-          windowManager.setTitle(title);
-        }
+        setCurrentTitle(title, isPrefix: true);
         return title;
       },
       locale: _lang.toLocale(),

lib/settings.dart

@@ -135,6 +135,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
 
   @override
   Widget build(BuildContext context) {
+    setCurrentTitle(AppLocalizations.of(context)!.settings);
     return Scaffold(
         appBar: AppBar(
           leading: IconButton(