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When you insert a new item in an existing menu, you probably want to
put it in a particular place among the menu's existing items. If you
define-key to add the item, it normally goes at the front of
the menu. To put it elsewhere in the menu, use
define-key, but position the binding in map after the binding for the event after. The argument key should be of length one--a vector or string with just one element. But after should be a single event type--a symbol or a character, not a sequence. The new binding goes after the binding for after. If after is
tor is omitted, then the new binding goes last, at the end of the keymap. However, new bindings are added before any inherited keymap.
Here is an example:
(define-key-after my-menu [drink] '("Drink" . drink-command) 'eat)
makes a binding for the fake function key DRINK and puts it right after the binding for EAT.
Here is how to insert an item called `Work' in the `Signals'
menu of Shell mode, after the item
(define-key-after (lookup-key shell-mode-map [menu-bar signals]) [work] '("Work" . work-command) 'break)
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