bug#14257: 24.3.50; (elisp) `Modifying Menus' - clarify second example

[Drew Adams]

It might help if some motivation were given for the second example:
 
 (define-key-after
   (lookup-key shell-mode-map [menu-bar signals])
   [work] '("Work" . work-command) 'break)
 
My guess is that that example was added to tell users how to deal with
the error that used to be raised if you used something like this:
 
 (define-key-after minibuffer-local-completion-map
   [menu-bar minibuf foo]
   '(menu-item "Foo" foo) 'quit)
 
Instead of this:
 
 (define-key-after (lookup-key minibuffer-local-completion-map
                               [menu-bar minibuf])
   [foo]
   '(menu-item "Foo" foo) 'quit)
 
That error is no longer raised.  And the doc string has been updated to
no longer say this:
 
 "KEY must contain just one event type--that is to say, it must be a
  string or vector of length 1."
 
If the example still has a purpose (some other purpose), then consider
mentioning it.
 
And it would at least help to mention that the `lookup-key' sexp in the
example returns a keymap, not a key.  Without knowing that, the second
example would not make much sense (hence, some readers will guess it,
but it would still help to mention it).
 
 
 

In GNU Emacs 24.3.50.1 (i386-mingw-nt5.1.2600)
 of 2013-04-17 on ODIEONE
Bzr revision: 112320 monnier@iro.umontreal.ca-20130418001233-g6wsqi5bpq2hsd0k
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.7) --no-opt --enable-checking --cflags
 -IC:/Devel/emacs/build/include --ldflags -LC:/Devel/emacs/build/lib'