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bug#20637: incompatible, undocumented change to vc-working-revision

From: Glenn Morris
Subject: bug#20637: incompatible, undocumented change to vc-working-revision
Date: Sat, 23 May 2015 19:49:46 -0400
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) 
Package: emacs
Version: 25.0.50

mkdir /tmp/git
cd /tmp/git
git init
touch 1

emacs-24.5:
  (vc-working-revision "1")  ;  -> nil

Current master:
  (vc-working-revision "1")  ;  "master"

C-h f vc-working-revision:
  If FILE is not registered, this function always returns nil.

This changes documented behaviour without updating the doc or making a
NEWS entry.

Example breakage:
http://lists.gnu.org/archive/html/help-gnu-emacs/2015-05/msg00384.html
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