fix(ui): align history search placeholder and prevent clipping (#1506)

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

@@ -37,6 +37,7 @@ import '../../../../shared/widgets/app_toast.dart';
 import '../../../../l10n/l10n.dart';
 import '../../../../util/util.dart';
 import '../../application/pending_create_task.dart';
+import '../widgets/history_search_field.dart';
 import '../widgets/create_task_action_buttons.dart';
 import '../widgets/resolve_file_tree.dart';
 
@@ -1247,20 +1248,9 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
                 height: screenSize.height < 560 ? screenSize.height * 0.55 : 360,
                 child: Column(
                   children: [
-                    SizedBox(
-                      height: 38,
-                      child: AppTextField(
-                        key: const ValueKey('create-history-filter'),
-                        controller: filterController,
-                        placeholder: Text(
-                          dialogContext.l10n.searchHistory,
-                          style: TextStyle(color: palette.searchHint, fontSize: 13),
-                        ),
-                        features: [
-                          InputFeature.leading(Icon(Icons.search_rounded, size: 15, color: palette.textMuted)),
-                        ],
-                        onChanged: (value) => setDialogState(() => filterQuery = value),
-                      ),
+                    HistorySearchField(
+                      controller: filterController,
+                      onChanged: (value) => setDialogState(() => filterQuery = value),
                     ),
                     const SizedBox(height: 10),
                     Expanded(

ui/flutter/lib/features/tasks/presentation/widgets/history_search_field.dart

@@ -0,0 +1,38 @@
+import 'package:shadcn_flutter/shadcn_flutter.dart';
+
+import '../../../../l10n/l10n.dart';
+import '../../../../shared/theme/app_design_tokens.dart';
+import '../../../../shared/theme/app_palette.dart';
+import '../../../../shared/widgets/app_text_field.dart';
+
+class HistorySearchField extends StatelessWidget {
+  const HistorySearchField({super.key, required this.controller, required this.onChanged});
+
+  final TextEditingController controller;
+  final ValueChanged<String> onChanged;
+
+  @override
+  Widget build(BuildContext context) {
+    final palette = AppPalette.of(context);
+    const textStyle = TextStyle(fontSize: 13);
+    return ConstrainedBox(
+      // Allow large accessibility text to grow instead of clipping the line.
+      constraints: const BoxConstraints(minHeight: 38),
+      child: AppTextField(
+        key: const ValueKey('create-history-filter'),
+        controller: controller,
+        style: textStyle,
+        padding: AppDesignTokens.compactTextFieldPadding,
+        placeholder: Text(
+          context.l10n.searchHistory,
+          // Match the editable text metrics so the cursor and hint align.
+          style: textStyle.copyWith(color: palette.searchHint),
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+        ),
+        features: [InputFeature.leading(Icon(Icons.search_rounded, size: 15, color: palette.textMuted))],
+        onChanged: onChanged,
+      ),
+    );
+  }
+}

ui/flutter/test/features/tasks/presentation/history_search_field_test.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gopeed/features/tasks/presentation/widgets/history_search_field.dart';
+import 'package:gopeed/l10n/l10n.dart';
+import 'package:gopeed/shared/theme/app_component_themes.dart';
+import 'package:gopeed/shared/theme/app_theme.dart';
+import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
+
+void main() {
+  for (final platform in [TargetPlatform.android, TargetPlatform.iOS, TargetPlatform.macOS]) {
+    for (final scale in [1.0, 1.5, 2.0]) {
+      testWidgets('history hint and input line align on $platform at scale $scale', (tester) async {
+        debugDefaultTargetPlatformOverride = platform;
+        addTearDown(() => debugDefaultTargetPlatformOverride = null);
+        final controller = TextEditingController();
+        addTearDown(controller.dispose);
+        String? query;
+        for (final width in [280.0, 360.0, 600.0]) {
+          await tester.pumpWidget(
+            shad.ShadcnApp(
+              theme: AppTheme.light(),
+              materialTheme: AppTheme.materialLight(),
+              localizationsDelegates: AppLocalizations.localizationsDelegates,
+              supportedLocales: AppLocalizations.supportedLocales,
+              home: AppComponentThemes(
+                child: Builder(
+                  builder: (context) => Localizations.override(
+                    context: context,
+                    locale: const Locale('zh'),
+                    child: MediaQuery(
+                      data: MediaQueryData(textScaler: TextScaler.linear(scale)),
+                      child: Center(
+                        child: SizedBox(
+                          width: width,
+                          child: HistorySearchField(controller: controller, onChanged: (value) => query = value),
+                        ),
+                      ),
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          );
+          await tester.pumpAndSettle();
+          final editable = tester.state<EditableTextState>(find.byType(EditableText)).renderEditable;
+          final hint = tester.renderObject<RenderBox>(find.text('搜索历史记录…'));
+          expect(editable.preferredLineHeight, lessThanOrEqualTo(editable.size.height));
+          expect(hint.size.height, closeTo(editable.preferredLineHeight, 0.1));
+          expect(hint.localToGlobal(Offset.zero).dy, closeTo(editable.localToGlobal(Offset.zero).dy, 0.1));
+          expect(tester.takeException(), isNull);
+        }
+        await tester.enterText(find.byType(EditableText), 'example');
+        expect(query, 'example');
+        debugDefaultTargetPlatformOverride = null;
+      });
+    }
+  }
+}