Down arrow on a <Select> component will open the drop-down but not select the first option

[cuibonobo]

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

Reproduction link

Steps to reproduce

Once the example has completely loaded, the select element should be automatically focused. Hit the down arrow on the keyboard to open the drop-down.

What is expected?

The first option should be selected when the drop-down opens by hitting the down arrow.

What is actually happening?

The drop-down opens, but the first option is not selected.

Environment	Info
antd	4.6.5
React	16.13.1
System	Windows 10
Browser	Firefox 80.0.1

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The Select element requires that you press the down arrow twice in order to select the first option. This is not consistent with the default HTML select element. In addition, hitting the Tab key does not select the currently highlighted option, but this is a separate issue: #26876.

[afc163]

See https://codesandbox.io/s/antd-reproduction-template-forked-q8ls2

[cuibonobo]

Thanks for providing a solution, but the documentation for defaultActiveFirstOption says that the default value for this option is true. If that were the case, the desired behavior would happen by default without needing to specify the option.

It seems to me like there is still a bug: either the default behavior for defaultActiveFirstOption is incorrect, or the documentation should list the default value as false.