get-shortcut in selectable-menu-item<%>
Gets the keyboard shortcut character or virtual key for the menu
item. This character or key is combined with the shortcut prefix,
which is reported by
get-shortcut-prefix.
If the menu item has no shortcut, #f is returned.
The shortcut part of a menu item name is not included in the label
returned by
get-label.
For a list of allowed key symbols, see
get-key-code in key-event% .