menu: space key in keyboard navigation

[gfaceless]

Bug, feature request, or proposal:

bug

What is the expected behavior?

enter and space keys can be both used to trigger button press when navigating by keyboard. After menu is opened, the first menu item should be focused automatically, but using space key fails to do so. (while enter key does the focus as expected)

What are the steps to reproduce?

official demo.

Adding a space key check here in the source code works:
if (event.keyCode === ENTER || event.keyCode === SPACE)

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