Awkward navigation of AutoComplete when defaultActiveFirstOption=false and no values are selected

[ymzong]

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

Reproduction link

Steps to reproduce

Route 1):

• Enter "foo" into the AutoComplete bar
• Press enter without selecting the matching "foo" option in the dropdown

Route 2):

• Enter "apple" into the AutoComplete bar
• Press enter without selecting any options in the dropdown

What is expected?

The outer form should be submitted, thereby alerting "submit" to the browser in the demo.

My rationale: Even though no options are selected in the dropdown, if the user enters some text and hits enter, s/he should expect AutoComplete to actually use the value and proceed to submit the form.

What is actually happening?

Nothing happens since no option is selected.

Environment	Info
antd	3.18.1
React	16.8.6
System	Windows
Browser	Chrome

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This glitch only occurs when defaultActiveFirstOption={false} because otherwise the first match always gets selected by default. Current workaround is for user to press Esc after entering the keyword and then press Enter, but I don't think that's ideal...

[afc163]

similar with #14544 and #10861

[zombieJ]

Hmmm... seems close prevented by empty selection. It should adjust.

[ymzong]

Thanks for the quick turnaround @zombieJ @afc163!