bug/feature - emacs doesn't tell you about keys with multiple prefixes

[Karl Chen <quarl@hkn.eecs.berkeley.edu>]

With the code below, if you do "C-h k M-b M-a" , Emacs will tell you that
mark-paragraph is on "M-h, M-a, M-b" ; it will not tell you that it is also on
M-b M-a or M-b M-b (even though you just pressed those keys to get to this
screen!). Same goes with the "matched:" message when you type M-x
mark-paragraph (before you hit RET).

Regardless of bad coding style etc I it is useful to have aliases for prefixes
- for example I like using M-v instead of/in addition to C-x v and the easiest
way to do this is to (global-set-key [ (meta v) ] vc-prefix-map). This
confusing behavior of displaying only keys under the first key bound to a
keymap exists in Emacs 21 for the "M-x ... [matched; <keys>]" message and in
Emacs CVS for describe-key as well.



(global-set-key [(meta a)] nil)
(global-set-key [(meta b)] nil)

(global-set-key [(meta a) (meta a)] 'mark-paragraph)
(global-set-key [(meta a) (meta b)] 'mark-paragraph)

;;; >>>>>>>>>>>>>>>>>>>>>
(global-set-key [(meta b)] (lookup-key (current-global-map) [(meta a)]))
;;; <<<<<<<<<<<<<<<<<<<<<

;; after the previos line, these two lines have no effect on the reverse key lookups.
(global-set-key [(meta b) (meta a)] 'mark-paragraph)
(global-set-key [(meta b) (meta b)] 'mark-paragraph)


-- 
Karl Chen / quarl@quarl.org