Parent menu items shown up in drilldown menus

[t3easy]

How can we reproduce this bug?

1. Generate a drilldown menu with a submenu that has less menu items than the parent
2. open the submenu with lesser entries
3. parents are still sown

What did you expect to happen?
Parent menu items are unvisible.

What happened instead?
Parent menu items are visible.

It worked in 6.2.3 but broken in 6.2.4
Broken by 88d7225

Test case:
http://codepen.io/anon/pen/VmXQaB

[ncoden]

Hi @t3easy,

This is a duplicate of #9368, and has been fixed in #9423.

[t3easy]

Hi @ncoden,
thanks for the hint, your right!
I've added the min-height to my app.scss.
For general: is a v6.2.5 planed or do I have to switch to v6.3 if its out?

[ncoden]

The next release is v6.3, and there is no v6.2.5 planed. I don't know why and I will talk about it to the rest of the team.

poke @kball @andycochran @brettsmason @colin-marshall