Flex groups inside an accordion result in scroll behaviour

[pugnascotia]

If you next a flex group inside an accordion, you can find that then even though the accordion when opened is big enough to display all the content, the content still exhibits scrolling. @snide suspects this is due to negative margins on the flex group.

The problem can be worked around by using overflow: hidden on the .euiAccordion__childWrapper element, but that probably isn't a correct fix.