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bug#12581: 24.2.50: redo+ fails to modify edit menu
From: |
Stefan Monnier |
Subject: |
bug#12581: 24.2.50: redo+ fails to modify edit menu |
Date: |
Fri, 05 Oct 2012 17:55:27 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux) |
> I have tracked this down to the command
> (setcar (cdr (memq :enable (assq 'undo menu-bar-edit-menu))) nil)
[...]
> that fails with the same error. Actually redo+ attempts to setcar to
> something else but obviously the problem is that for some reason
[...]
> Is this a bug or expected behavior? Should redo+ be modified?
It's not a bug, AFAIC. You can change redo+ to use something like:
(define-key menu-bar-edit-menu [undo]
;; We use `cdr+assq' instead of `lookup-key' because lookup-key
;; would return the actual binding inside the menu-item, whereas
;; we want the whole menu-item (IOW we don't want the get_keyelt
;; part of lookup-key). We could use
;; (catch 'found
;; (map-keymap (lambda (k v)
;; (if (eq k 'undo) (throw 'found v)))
;; menu-bar-edit-menu))
;; instead.
(let ((elem (copy-sequence (cdr (assq 'undo menu-bar-edit-menu)))))
(setcar (cdr (memq :enable elem)) <your-exp-here>)
elem))
-- Stefan