fix(Picker): merge two focus

[Yangzhedi]

fix #11249
merge two focus into one focus

[ant-design-bot]

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[codecov]

Codecov Report

Merging #519 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #519   +/-   ##
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  Coverage   89.38%   89.38%           
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  Files          10       10           
  Lines         688      688           
  Branches      198      198           
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  Hits          615      615           
  Misses         63       63           
  Partials       10       10

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[zombieJ]

We should handle onFocus instead of change focus target...

[Yangzhedi]

😂

[Yangzhedi]

onFocus is bind on span which wrapped Picker,
https://github.com/ant-design/ant-design/blob/master/components/date-picker/createPicker.tsx#L246
onFocus={props.onFocus} , how to merge the focus ?

[zombieJ]

onFocus = this.onFocus and do wrap logic.