Modal footer buttons not spaced when using href in button

[tqwewe]

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

Reproduction link

Steps to reproduce

Create a modal with two custom action buttons.
Add a href to the second button.

footer={[
  <Button key="back" onClick={this.handleCancel}>
    Return
  </Button>,
  <Button
    key="submit"
    href="google.com" // <- This breaks the spacing
    type="primary"
    loading={loading}
    onClick={this.handleOk}
  >
    Submit
  </Button>
]}

What is expected?

The same spacing between the action buttons when not using a href.

What is actually happening?

There is no space between the buttons when using a href.

Environment	Info
antd	4.13.1
React	17.0.1
System	Mac OS BigSur
Browser	Google Chrome - Version 88.0.4324.192 (Official Build) (x86_64)

[github-actions]

Hello @acidic9. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please send your Pull Request to proper branch (feature branch for the new feature, master for bugfix and other changes), fill the Pull Request Template here, provide changelog/TypeScript/documentation/test cases if needed and make sure CI passed, we will review it soon. We appreciate your effort in advance and looking forward to your contribution!

你好 @acidic9，我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。请将 Pull Request 发到正确的分支（新特性发到 feature 分支，其他发到 master 分支），务必填写 Pull Request 内的预设模板，提供改动所需相应的 changelog、TypeScript 定义、测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献。