Make the focusing input be optional, when trigger the "onSearch" event on Input.Search component

[YaoKaiLun]

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

What problem does this feature solve?

I use Input.Search component in my website, and my website is responsible. When i click search button in the mobile, it will trigger focusing input, and it cause keyboard pop up.
I think it will be better to have a parameter to controller this feature that if focusing input after triggering the "onSearch" event.

What does the proposed API look like?

Add a parameter "focusAfterSearch", the default value is "true".

ant-design/components/input/Search.tsx

Line 50 in 333f63b

this.input.focus();

[afc163]

We can add mobile device detection before focus input by using https://github.com/juliangruber/is-mobile

if (!isMobile()) {
  this.input.focus(); 
}

Could you send us a PR to fix it?

[ant-design-bot]

Hello @YaoKaiLun. We totally like your proposal/feedback, welcome to send us Pull Request for it. Please send your Pull Request to proper branch (feature branch for 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. Appreciate it advance and we are looking forword to your contribution!

你好 @YaoKaiLun, 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！

[yoyo837]

Why not use prop like autoFocus, 交由业务去做?

[yoyo837]

开先河的感觉。

[afc163]

@yoyo837 It is not autoFocus but a focusAfterSearch prop like @YaoKaiLun propoksed.

But I think it is better to reduce those props which are too complex to understand by setting a default hehavior.