Amend doc-string.
Properly (re-)focus entry/item.
Add missing 'require.
Assign a keymap to the vocabulary widget.  This is managed by the
overlay the parent is providing.
Assign keymap to the vocabulary item.
Remove unused code.
Add reminder.
Assign the item's keymap to the item itself; leave the tag string unpropertized.
Remove debugging code.
Remove obsolete key bindings.
Add missing 'require.