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| menu<-selection |
|chain*<-multiple_selection
equals @off,
returns menu_item<-value
of the selected menu_item. Otherwise it returns a new chain with the
menu<-value for each of the selected items
(the chain may be empty).
Diagnostics: Fails if menu<-multiple_selection
equals @off
and no items are selected. This should only happen it there are no items
in the menu.
->selection