Depending on how these components are used, and what styles have been

applied elsewhere, it's possible to break the appearance of both

ButtonGroup and Menu.
ButtonGroup assumed a default margin of 0, but if anything styled

margins for a button-based selector, this could separate the buttons.

It was very noticeable in a MenuButton. We now hard-code an explicit

margin.
Menu items assumed a text alignment of left, but similarly, it would

end up inheriting an alignment. We now hard-code left.

Verified this fixed issues with the Publish menu button in the Review

Dialog.