Please provide a reproduction of the bug in a codepen:

https://codepen.io/makopch/pen/rNwbwgp

Open the Menu and use the keyboard to cycle through the items

Actual behavior:

The keyboarding is not consistent. If you down arrow in the search box, focus will go back to the top menuitem of the menu. If you up-arrow, focus will go to the last item in the menu.

Expected behavior:

The searchbox should behave like the other menu items and you should be able to arrow in and out of it without jumping to the top or bottom of the menu.

Priorities and help requested:

Are you willing to submit a PR to fix? (Yes, No)

Requested priority: (Blocking, High, Normal, Low) Normal

Products/sites affected: (if applicable)