Select expand scroll style weird in the affix

[1123612483]

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

https://muffinyu.github.io/antd-online/

Steps to reproduce

1.Click on the first select component.(选择第一个选择框)
2.Scrolling window.(滚动窗口)
3.Click on the second select component.(选择第二个选择框)
4.Scrolling window again.(再次滚动窗口)

What is expected?

Expanded style is normal or expand box hidden when scrolling.(展开的样式是正常的或者滚动时隐藏展开框)

What is actually happening?

Expanded style is weird.(展开的样式是怪异的)

Environment	Info
antd	3.25.3
React	16.12.0
System	win10
Browser	Google Chrome 78.0.3904.108

---

Open peproduction link,paste the code below.
(打开重现链接，并粘贴下面的代码)

import { Affix, Button, Select } from 'antd';

const Option = Select.Option;

class Demo extends React.Component {
  state = {
    top: 10,
    bottom: 10,
  };

  render() {
    return (
      <div>
        <Affix offsetTop={this.state.top}>
          <Button
            type="primary"
            onClick={() => {
              this.setState({
                top: this.state.top + 10,
              });
            }}
          >
            Affix top
          </Button>
          <Select defaultValue="lucy" style={{ width: 120 }} >
            <Option value="lucy">Lucy</Option>
            <Option value="jack">Jack</Option>
          </Select>
          <Select defaultValue="lucy" style={{ width: 120 }} getPopupContainer={triggerNode => triggerNode.parentElement} >
            <Option value="lucy">Lucy</Option>
            <Option value="jack">Jack</Option>
          </Select>
          <select>
            <option value="lucy">Lucy</option>
            <option value="lucy">Jack</option>
          </select>
        </Affix>
      </div>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);

[afc163]

问题是啥？

[1123612483]

问题是啥？

选中之后，然后滚动页面

[afc163]

https://ant.design/docs/react/faq-cn#Select-Dropdown-DatePicker-TimePicker-Popover-Popconfirm-%E4%BC%9A%E8%B7%9F%E9%9A%8F%E6%BB%9A%E5%8A%A8%E6%9D%A1%E4%B8%8A%E4%B8%8B%E7%A7%BB%E5%8A%A8%EF%BC%9F

[1123612483]

https://ant.design/docs/react/faq-cn#Select-Dropdown-DatePicker-TimePicker-Popover-Popconfirm-%E4%BC%9A%E8%B7%9F%E9%9A%8F%E6%BB%9A%E5%8A%A8%E6%9D%A1%E4%B8%8A%E4%B8%8B%E7%A7%BB%E5%8A%A8%EF%BC%9F

第二个Select我用了getPopupContainer，点击Select展开后滚动，展开框和Select都分离了，确定没问题？

[github-actions]

Hi @1123612483. Current version (3.x) is off the maintenance period. We may not accept pull request or fix bug with it anymore. This topic will be auto closed.

你好 @1123612483，当前版本（3.x）已经过了维护期。我们不会再接受对其的相关 PR 与 issue。当前 topic 会被自动关闭。