单击按钮时Flutter searchable_dropdown Ui不更新，并且在按钮的onPressed()内调用setState()

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  String selectedValue;

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        SearchableDropdown<String>(
          items: [
            DropdownMenuItem(value: '1', child: Text('Option 1')),
            DropdownMenuItem(value: '2', child: Text('Option 2')),
          ],
          onChanged: (value) {
            setState(() {
              selectedValue = value;
            });
          },
        ),
        ElevatedButton(
          onPressed: () {
            // 模拟选择某个值
            setState(() {
              selectedValue = '1';
            });
          },
          child: Text('Select Option 1'),
        ),
      ],
    );
  }
}

SearchableDropdown<String>(
  items: [
    DropdownMenuItem(value: '1', key: ValueKey('1'), child: Text('Option 1')),
    DropdownMenuItem(value: '2', key: ValueKey('2'), child: Text('Option 2')),
  ],
  onChanged: (value) {
    setState(() {
      selectedValue = value;
    });
  },
),

ElevatedButton(
  onPressed: () async {
    // 模拟异步操作
    await Future.delayed(Duration(seconds: 1));
    setState(() {
      selectedValue = '1';
    });
  },
  child: Text('Select Option 1'),
),

dependencies:
  searchable_dropdown: ^1.1.3