fix(macos): prevent closed task windows from reopening (#1492)

ui/flutter/lib/features/home/presentation/pages/home_page.dart

@@ -19,6 +19,7 @@ import '../../../../shared/widgets/responsive_navigation_layout.dart';
 import '../../../../l10n/l10n.dart';
 import '../../../../util/util.dart';
 import '../../../tasks/application/tasks_controller.dart';
+import '../../../tasks/application/task_list_navigation.dart';
 import '../../../tasks/application/pending_update_task.dart';
 import '../../../tasks/application/task_batch_selection_controller.dart';
 import '../../../tasks/domain/task_record.dart';
@@ -86,6 +87,11 @@ class _HomePageState extends ConsumerState<HomePage> {
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
     final tasksAsync = ref.watch(tasksControllerProvider);
+    ref.listen(taskListNavigationProvider, (_, _) {
+      _searchController.clear();
+      _setActiveFilter(_TaskFilter.downloading);
+      setState(() => _batchMode = false);
+    });
     final tasksState = tasksAsync.value;
     final tasks = tasksState?.tasks ?? const <TaskRecord>[];
     final filteredTasks = _filteredTasks(tasks);

ui/flutter/lib/features/tasks/application/task_list_navigation.dart

@@ -0,0 +1,11 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final taskListNavigationProvider = NotifierProvider<TaskListNavigation, int>(TaskListNavigation.new);
+
+// A request also resets an already-visible list's filter, search and selection.
+class TaskListNavigation extends Notifier<int> {
+  @override
+  int build() => 0;
+
+  void showDownloading() => state++;
+}

ui/flutter/lib/features/tasks/presentation/pages/create_task_window_page.dart

@@ -737,6 +737,19 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
     await windowManager.close();
   }
 
+  Future<void> _finishCreation() async {
+    if (widget.windowController != null) {
+      // Navigation is best-effort after a successful submission. A navigation
+      // failure must not leave a completed form available for resubmission.
+      try {
+        await ref.read(appCapabilitiesProvider).navigation.showDownloadingTasks();
+      } catch (error) {
+        debugPrint('Unable to select downloading tasks: $error');
+      }
+    }
+    await _closeWindow();
+  }
+
   Future<void> _loadDefaults() async {
     try {
       final config = await ref.read(gopeedServiceProvider).getConfig();
@@ -863,7 +876,7 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
                 );
           }),
         );
-        await _closeWindow();
+        await _finishCreation();
         return;
       }
 
@@ -879,7 +892,7 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
         }
         return;
       }
-      await _closeWindow();
+      await _finishCreation();
     } catch (error) {
       if (mounted) {
         _showToast(error.toString());