Fix app start with a hidden window

packages/flet/lib/src/controls/page.dart

@@ -20,6 +20,7 @@ import '../models/page_design.dart';
 import '../routing/route_parser.dart';
 import '../routing/route_state.dart';
 import '../routing/router_delegate.dart';
+import '../services/service_binding.dart';
 import '../services/service_registry.dart';
 import '../utils/device_info.dart';
 import '../utils/locale.dart';
@@ -57,6 +58,9 @@ class _PageControlState extends State<PageControl> with WidgetsBindingObserver {
   late final AppLifecycleListener _appLifecycleListener;
   ServiceRegistry? _pageServices;
   ServiceRegistry? _userServices;
+  String? _userServicesUid;
+  ServiceBinding? _windowService;
+  Control? _windowControl;
   bool? _prevOnKeyboardEvent;
   bool _keyboardHandlerSubscribed = false;
   String? _prevViewRoutes;
@@ -95,12 +99,15 @@ class _PageControlState extends State<PageControl> with WidgetsBindingObserver {
 
     _attachKeyboardListenerIfNeeded();
     widget.control.addInvokeMethodListener(_invokeMethod);
+    widget.control.addListener(_onPageControlChanged);
+    _ensureServiceRegistries();
   }
 
   @override
   void didChangeDependencies() {
     debugPrint("Page.didChangeDependencies: ${widget.control.id}");
     super.didChangeDependencies();
+    _ensureServiceRegistries();
     _loadFontsIfNeeded(FletBackend.of(context));
   }
 
@@ -109,26 +116,7 @@ class _PageControlState extends State<PageControl> with WidgetsBindingObserver {
     debugPrint("Page.didUpdateWidget: ${widget.control.id}");
     super.didUpdateWidget(oldWidget);
     _updateMultiViews();
-
-    // page services
-    _pageServices ??= ServiceRegistry(
-        control: widget.control,
-        propertyName: "_services",
-        backend: FletBackend.of(context));
-
-    // user services
-    var userServicesControl = widget.control.child("_user_services");
-    if (userServicesControl != null) {
-      if (_userServices == null ||
-          _userServices?.control.internals?["uid"] !=
-              userServicesControl.internals?["uid"]) {
-        _userServices = ServiceRegistry(
-            control: userServicesControl,
-            propertyName: "_services",
-            backend: FletBackend.of(context));
-      }
-    }
-
+    _ensureServiceRegistries();
     _attachKeyboardListenerIfNeeded();
     _loadFontsIfNeeded(FletBackend.of(context));
   }
@@ -148,9 +136,60 @@ class _PageControlState extends State<PageControl> with WidgetsBindingObserver {
       HardwareKeyboard.instance.removeHandler(_handleKeyDown);
     }
     widget.control.removeInvokeMethodListener(_invokeMethod);
+    widget.control.removeListener(_onPageControlChanged);
+    _pageServices?.dispose();
+    _userServices?.dispose();
+    _windowService?.dispose();
     super.dispose();
   }
 
+  void _onPageControlChanged() {
+    _ensureServiceRegistries();
+  }
+
+  void _ensureServiceRegistries() {
+    if (!mounted) {
+      return;
+    }
+    var backend = FletBackend.of(context);
+
+    _pageServices ??= ServiceRegistry(
+        control: widget.control,
+        propertyName: "_services",
+        backend: backend);
+
+    var userServicesControl = widget.control.child("_user_services");
+    if (userServicesControl != null) {
+      var uid = userServicesControl.internals?["uid"];
+      if (_userServices == null || _userServicesUid != uid) {
+        _userServices?.dispose();
+        _userServices = ServiceRegistry(
+            control: userServicesControl,
+            propertyName: "_services",
+            backend: backend);
+        _userServicesUid = uid;
+      }
+    } else if (_userServices != null) {
+      _userServices?.dispose();
+      _userServices = null;
+      _userServicesUid = null;
+    }
+
+    var windowControl = widget.control.child("window", visibleOnly: false);
+    if (windowControl != null) {
+      if (!identical(windowControl, _windowControl)) {
+        _windowService?.dispose();
+        _windowService =
+            ServiceBinding(control: windowControl, backend: backend);
+        _windowControl = windowControl;
+      }
+    } else if (_windowService != null) {
+      _windowService?.dispose();
+      _windowService = null;
+      _windowControl = null;
+    }
+  }
+
   Future<dynamic> _invokeMethod(String name, dynamic args) async {
     debugPrint("Page.$name($args)");
 

packages/flet/lib/src/controls/view.dart

@@ -168,10 +168,6 @@ class _ViewControlState extends State<ViewControl> {
         overlayWidgets.add(PageMedia(view: widget.control.parent));
       }
 
-      var windowControl = control.parent?.get("window");
-      if (windowControl != null && isRootView && isDesktopPlatform()) {
-        overlayWidgets.add(ControlWidget(control: windowControl));
-      }
     }
 
     Widget body = Stack(children: [

packages/flet/lib/src/flet_backend.dart

@@ -192,6 +192,7 @@ class FletBackend extends ChangeNotifier {
   }
 
   _registerClient() {
+    debugPrint("Registering web client: $page");
     _send(
         Message(
             action: MessageAction.registerClient,
@@ -211,7 +212,7 @@ class FletBackend extends ChangeNotifier {
                   "width": page.get("width"),
                   "height": page.get("height"),
                   "platform": page.get("platform"),
-                  "window": page.child("window")!.toMap(),
+                  "window": page.child("window", visibleOnly: false)!.toMap(),
                   "media": page.get("media"),
                 }).toMap()),
         unbuffered: true);
@@ -333,7 +334,7 @@ class FletBackend extends ChangeNotifier {
     if (isDesktopPlatform()) {
       var windowState = await getWindowState();
       debugPrint("Window state updated: $windowState");
-      var window = page.child("window")!;
+      var window = page.child("window", visibleOnly: false)!;
       updateControl(window.id, windowState.toMap());
       triggerControlEvent(window, "event", {"type": "resized"});
     }
@@ -470,8 +471,7 @@ class FletBackend extends ChangeNotifier {
     var template = appErrorMessage ?? defaultAppErrorMessageTemplate;
     final lines = const LineSplitter().convert(rawError);
     final message = lines.isNotEmpty ? lines.first : "";
-    final details =
-        lines.length > 1 ? lines.sublist(1).join("\n") : "";
+    final details = lines.length > 1 ? lines.sublist(1).join("\n") : "";
     template = template.replaceAll("{message}", message);
     if (details.isEmpty) {
       template = template.replaceAll(RegExp(r'(\r?\n)*\{details\}'), "");

packages/flet/lib/src/flet_core_extension.dart

@@ -101,7 +101,6 @@ import 'controls/time_picker.dart';
 import 'controls/transparent_pointer.dart';
 import 'controls/vertical_divider.dart';
 import 'controls/view.dart';
-import 'controls/window.dart';
 import 'controls/window_drag_area.dart';
 import 'flet_extension.dart';
 import 'flet_service.dart';
@@ -116,6 +115,7 @@ import 'services/shared_preferences.dart';
 import 'services/storage_paths.dart';
 import 'services/tester.dart';
 import 'services/url_launcher.dart';
+import 'services/window.dart';
 import 'utils/cupertino_icons.dart';
 import 'utils/material_icons.dart';
 
@@ -355,8 +355,6 @@ class FletCoreExtension extends FletExtension {
         return VerticalDividerControl(key: key, control: control);
       case "View":
         return ViewControl(key: key, control: control);
-      case "Window":
-        return WindowControl(key: key, control: control);
       case "WindowDragArea":
         return WindowDragAreaControl(key: key, control: control);
       default:
@@ -383,6 +381,8 @@ class FletCoreExtension extends FletExtension {
         return SemanticsServiceControl(control: control);
       case "StoragePaths":
         return StoragePaths(control: control);
+      case "Window":
+        return WindowService(control: control);
       case "Tester":
         return TesterService(control: control);
       case "UrlLauncher":