fix(discover): 点击页面取消搜索焦点

test/discover/home_all_dramas_grid_test.dart

@@ -295,6 +295,57 @@ void main() {
     );
   });
 
+  testWidgets('should_unfocus_search_without_losing_input_or_filter', (
+    tester,
+  ) async {
+    tester.view.physicalSize = const Size(390, 844);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+
+    await _pumpApp(tester, categoryRepository: _GridCategoryRepository());
+    await tester.tap(find.byKey(const Key('tab-discover')));
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byKey(const Key('discover-search')));
+    await tester.pump();
+    expect(
+      tester
+          .widget<TextField>(find.byKey(const Key('discover-search')))
+          .focusNode!
+          .hasFocus,
+      isTrue,
+    );
+
+    await tester.enterText(find.byKey(const Key('discover-search')), 'velvet');
+    await tester.pumpAndSettle();
+    expect(
+      find.byKey(const Key('home-drama-card-city-lights-demo')),
+      findsOneWidget,
+    );
+    expect(
+      find.byKey(const Key('home-drama-card-the-signal-demo')),
+      findsNothing,
+    );
+
+    await tester.tapAt(const Offset(70, 23));
+    await tester.pump();
+
+    final field = tester.widget<TextField>(
+      find.byKey(const Key('discover-search')),
+    );
+    expect(field.focusNode!.hasFocus, isFalse);
+    expect(field.controller!.text, 'velvet');
+    expect(
+      find.byKey(const Key('home-drama-card-city-lights-demo')),
+      findsOneWidget,
+    );
+    expect(
+      find.byKey(const Key('home-drama-card-the-signal-demo')),
+      findsNothing,
+    );
+  });
+
   testWidgets('should_show_continue_watching_only_when_a_record_exists', (
     tester,
   ) async {