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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [mange@freemail.hu: grep-tree doesn't shell-quote-argument]
Date: Sat, 22 Apr 2006 08:03:30 -0400
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    Below is a patch which merges grep-tree into grep-find, with
    the new grep-tree interface as the default API, while a C-u
    prefix requests using the old grep-find interface.

That makes it an incompatible change.  grep-find has existed since
years ago; grep-tree is new.

We could avoid that incompatible change by making grep-find
with C-u implement the grep-tree behavior.

Is there some specific reason you propose the incompatible way?