cascader showSearch放在form使用时双击或者搜索时会显示浏览器的提示字符

[lanll]

`const { Form,Cascader,Roe,Col } = antd;
const FormItem = Form.Item;

const options = [{
value: 'zhejiang',
label: 'Zhejiang',
children: [{
value: 'hangzhou',
label: 'Hangzhou',
children: [{
value: 'xihu',
label: 'West Lake',
}],
}],
}, {
value: 'jiangsu',
label: 'Jiangsu',
children: [{
value: 'nanjing',
label: 'Nanjing',
children: [{
value: 'zhonghuamen',
label: 'Zhong Hua men',
}],
}],
}];

class App extends React.Component {
render() {
const {getFieldDecorator}= this.props.form;
return (

{getFieldDecorator('cantonIds', {
})(

)}

    </FormItem>

    </Form>
    <Cascader expandTrigger="hover" options={options} showSearch/>
    </div>
);

}
}

App = Form.create()(App);
ReactDOM.render(, document.getElementById('container'));`

上述为演示代码，

现象：

预期：

[afc163]

貌似是 autoComplete 没关，来个 PR 如何？

[lanll]

最糟糕的情况是自动提示的掩盖了数据。autoComplete如何关闭

[lock]

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