Adjusts the widgetry of the input chooser to clamp the list and add a separator between the search bar and the list. The list's shadow is no longer clipped, and keyboard navigation now scrolls.
.boxed-list
.content
The `.content` style class is deprecated in favor of the `.boxed-list` style class, which is named after the design pattern it's used for.
Drop the wm-common insanity.
