Calendar moves to top left corner on click or browser resize for DatePicker inside a Dropdown

[blaqbern]

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

Version

3.8.0

Environment

macOS, chrome 67, React 16.3

Reproduction link

Steps to reproduce

• click on the button labeled "click me"
• inside the dropdown there is a date picker; click the input to open the calendar component
• perform any of the following actions
  • click anywhere inside the calendar
  • resize the browser window
  • open/close devtools

What is expected?

The Calendar component remains in the same place for the entire time it is open (scrolling with the page is fine)

What is actually happening?

The Calendar component jumps up to the top left corner of the window

[afc163]

https://github.com/ant-design/ant-design/wiki/FAQ#select-dropdown-datepicker-timepicker-popover-popconfirm-will-disappear-when-i-click-another-popup-component-inside-it-how-to-resolve-it

#3487 #3438