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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fix in vc-ignore-dir-regexp
Date: Sat, 28 Apr 2007 10:47:46 -0400
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Xref: news.gmane.org gmane.emacs.devel:70328
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    In particular vc systems that need to ascend the directory tree
    looking for  vc directories should not appear in the default list.

Would you please be more concrete?
Which systems do that?