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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: menu-bar-map variable
Date: Sun, 01 Apr 2007 17:42:18 -0400
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To: Nick Roberts <nickrob@snap.net.nz>
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Xref: news.gmane.org gmane.emacs.devel:68901
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    (define-key lisp-interaction-mode-map [menu-bar edit] 'undefined)

    then I get:

    (local-key-binding [menu-bar])
    (keymap (edit . undefined))

    but tmm still thinks it's there because it's still in the global list

    (global-key-binding [menu-bar]):

    ...(edit "Edit" keymap (undo ...
	      ^^^^

Well, that shows the bug.  The definition as `undefined'
in the local map should not just be discarded.  It should be kept,
so that it overrides the global binding.  Only at the last moment
should it be treated as no definition.