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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: M-g in dired
Date: Sat, 05 Nov 2005 18:43:39 -0500
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Xref: news.gmane.org gmane.emacs.devel:45485
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/45485>

    `shadow_lookup' iterates over two maps (dired and global) and calls
    `Flookup_key' on them.  When `Flookup_key' returns 1 for the key
    "M-gn" on the dired map, the loop in `shadow_lookup' skips it

That's the place that has to be changed.

When this call to `Flookup_key' returns a number N, `shadow_lookup'
should look up a sub-key-sequence of the first N events.  If that
returns non-nil, the longer key is shadowed, so don't mention it at all.
If that returns non-nil, the longer key is not shadowed.

That avoids duplicating lots of code and avoids changing the calling
convention of Flookup_key.