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Allow non-matching input, but require confirmation

From: Stefan Monnier
Subject: Allow non-matching input, but require confirmation
Date: Fri, 29 Jun 2007 01:34:25 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux)

Currently, the `require-match' argument allows three different behaviors:
1) nil = allow any non-matching input.
2) t   = only allow matching input.  Automatically complete
         without confirmation.
3) neither nil nor t =  only allow matching input, but require confirmation
         after automatic completion.

I'd like to add a fourth one:

4) confirm-only = allow any non-matching input but require confirmation
                  if the input is not a valid completion.

Also I propose to use it for reading the file name in `find-file'.


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