Attached is a small patch fixes the Calendar opening issue on the Exception tab inside the schedules tab.
This is the only solution I found. The datetimepicker package does not provide any way to place the DOM in the body. The solution is will display the picker completely but you need to scroll a bit.
Please review.
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Thanks and Regards,
Aditya Toshniwal
pgAdmin Hacker | Sr. Software Engineer | EnterpriseDB India | Pune