bug#9922: 24.0.91; prompt by y-or-n-p changes tool bar on another frame

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Unfortunately, currently we don't have a way to tell `lookup-key' to
> just return the menu item without evaluating :filter functions.  The
> following hack would work around this for 24.1, though it's a bit
> black-magicky.
> Stefan, AFAICT think you wrote the code in question.  Opinions?

I think it's an OK workaround, tho it needs a comment like "lookup-key
without running :filters".

A better approach might be to provide a lookup-key which doesn't
run :filters.  Tho semantically, this is a murky area: without running
the filter we can't know whether the binding is nil, a keymap, or
something else, so we can't know whether it hides (or merges with)
other bindings in parent keymaps.  IOW, such a function should probably
return a list of "raw unreduced bindings".


        Stefan


> === modified file 'lisp/subr.el'
> *** lisp/subr.el	2012-04-19 06:04:05 +0000
> --- lisp/subr.el	2012-04-26 14:40:59 +0000
> ***************
> *** 2019,2025 ****
>              (let ((map (make-sparse-keymap)))
>                ;; Don't hide the menu-bar and tool-bar entries.
>                (define-key map [menu-bar] (lookup-key global-map [menu-bar]))
> !              (define-key map [tool-bar] (lookup-key global-map [tool-bar]))
>                map))
>   	  (aref	(catch 'read-key (read-key-sequence-vector prompt nil t)) 0))
>         (cancel-timer timer)
> --- 2019,2027 ----
>              (let ((map (make-sparse-keymap)))
>                ;; Don't hide the menu-bar and tool-bar entries.
>                (define-key map [menu-bar] (lookup-key global-map [menu-bar]))
> !              (define-key map [tool-bar]
> ! 	       (or (cdr (assq 'tool-bar global-map))
> ! 		   (lookup-key global-map [tool-bar])))
>                map))
>   	  (aref	(catch 'read-key (read-key-sequence-vector prompt nil t)) 0))
>         (cancel-timer timer)