GNU bug report logs - #17628
Strange output from C-x v =

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Richard Stallman <rms <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: Strange output from C-x v =
Date: Thu, 29 May 2014 06:45:50 -0400

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

I was editing gnu.org/licenses/license-list.html and had made the two
changes shown below.  The strangeness is, why does it output
"No changes between working revision and workfile." before
showing the differences between them?

No changes between working revision and workfile.
Index: license-list.html
===================================================================
RCS file: /web/www/www/licenses/license-list.html,v
retrieving revision 1.403
diff -c -r1.403 license-list.html
*** license-list.html	15 May 2014 06:03:29 -0000	1.403
--- license-list.html	29 May 2014 08:50:58 -0000
***************
*** 1889,1894 ****
--- 1889,1903 ----
  not sure of that might also be problematic.</p></dd>
  
  
+ <dt><a id="PPL" href="http://directory.fsf.org/wiki/License:PPL">Peer-Production License</a>
+     <span class="anchor-reference-id">(<a href="#PPL">#PPL</a>)</span></dt>
+ <dd>
+ <p>The Peer-Production License is not a free software license because
+ it restricts who can use the program and how.  It has several
+ provisions designed specially for artistic performances, and we would
+ not object to its use in the domain of art, but it should not be used
+ for software or other works that ought to be free.</p></dd>
+ 
  <dt><a id="PINE" href="http://directory.fsf.org/wiki/License:PINE">License of PINE</a>
      <span class="anchor-reference-id">(<a href="#PINE">#PINE</a>)</span></dt>
  <dd>
***************
*** 2406,2417 ****
      <span class="anchor-reference-id">
         (<a href="#ccbynd">#ccbynd</a>)</span></dt>
  
! <dd><p>This is the license used throughout the FSF web site.  This
! license provides much the same permissions as our verbatim copying
! license, but it's much more detailed.  We particularly recommend
! it for audio and/or video works of opinion.
! Please <a href="#which-cc">be specific about which Creative
! Commons license is being used</a>.</p></dd>
  
  </dl> <!-- end class="blue" -->
  
--- 2415,2426 ----
      <span class="anchor-reference-id">
         (<a href="#ccbynd">#ccbynd</a>)</span></dt>
  
! <dd><p>This is the license used throughout the GNU and FSF web sites.
! This license provides much the same permissions as our verbatim
! copying license, but it's much more detailed.  We particularly
! recommend it for audio and/or video works of opinion.
! Please <a href="#which-cc">be specific about which Creative Commons
! license is being used</a>.</p></dd>
  
  </dl> <!-- end class="blue" -->
  

-- 
Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
USA
www.fsf.org  www.gnu.org
Skype: No way! That's nonfree (freedom-denying) software.
  Use Ekiga or an ordinary phone call.

Message #8 received at 17628 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: rms <at> gnu.org
Cc: 17628 <at> debbugs.gnu.org
Subject: Re: bug#17628: Strange output from C-x v =
Date: Thu, 29 May 2014 12:20:13 -0400

Richard Stallman wrote:

> changes shown below.  The strangeness is, why does it output
> "No changes between working revision and workfile." before
> showing the differences between them?

It doesn't do that for me.
Looking at vc-diff-internal shows that message comes from:

    (if (and (zerop (buffer-size))
             (not (get-buffer-process (current-buffer))))
        ;; Treat this case specially so as not to pop the buffer.
        (progn
          (message "%s" (cdr messages))
          nil)

so I'm going to guess that this is just a manifestation of the same
process-handling-related issue you have been seeing with epg.
Emacs mistakenly thinks the process has exited before it has had a
chance to return anything.

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