react-select in EditDialog (DailogContent) dropdown overflow is not visible

[Niko Sams]

Possible solutions:

• override style of DialogContent to overflow visible (not a good idea as it breaks longer forms where we want the scroller)
• use react portal (react-select with https://react-select.com/advanced#portaling)
• use altenative to react-select that does portaling out of the box (eg the new material-ui autocomplete)