fix: nested trigger arrow position

[bestlyg]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
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• Other (about what?)

🔗 Related issue link

💡 Background and solution

公司里有一个代码，因为历史遗留原因，必须要使用嵌套popover，且内部的popover的挂载节点不是body上，而是外部的popover下面的一个div，我尝试着抽离出了一个demo：

import React from "react";
import { Popover, Button } from "antd";

const App: React.FC = () => {
  const domRef = React.useRef<any>();
  return (
    <Popover
      content={
        <>
          <div ref={domRef}></div>
          <Popover
            getPopupContainer={() => domRef.current}
            title="prompt text"
            placement="top"
            trigger="click"
            content={<span>Tooltip will show on mouse enter.</span>}
          >
            <span>Tooltip</span>
          </Popover>
        </>
      }
      title="Title"
      trigger="click"
      placement="bottomLeft"
    >
      <Button>Click me</Button>
    </Popover>
  );
};

export default App;

其中，外部的placement时bottomLeft的，内部的是top的。
此时就会发生内部的arrow指向有问题：

我认为这是不合理的，top的arrow却出现了bottom的arrow样式，每一个trigger只应该影响他当前的trigger arrow样式就够了。

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed arrow pointing issue when nesting triggers.
🇨🇳 Chinese	修复嵌套trigger时的arrow指向问题。

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[afc163]

@MadCcc 看看

[bestlyg]

hi, 我看到这个PR已经被approved了，但是还未合并，请问是有哪里有问题嘛？