bug#24986: 26.0.50; dired-unmark-backward doesn't unmark the region

[Tino Calancha <tino.calancha@gmail.com>]

According with the doc string, `dired-unmark-backward' should
unmark the region when is active.

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From 7bf191489f3a0cb15079eda8ec9d4762bf9a5493 Mon Sep 17 00:00:00 2001
From: Tino Calancha <tino.calancha@gmail.com>
Date: Wed, 23 Nov 2016 00:36:40 +0900
Subject: [PATCH] dired-unmark-backward: Unmark the region when is active

* lisp/dired.el (dired-unmark-backward): Call 'dired-unmark' with
a non-nil second argument.
---
 lisp/dired.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/dired.el b/lisp/dired.el
index daa6d77..a1eeb0b 100644
--- a/lisp/dired.el
+++ b/lisp/dired.el
@@ -3313,7 +3313,7 @@ dired-unmark-backward
 If the region is active in Transient Mark mode, unmark all files
 in the active region."
   (interactive "p")
-  (dired-unmark (- arg)))
+  (dired-unmark (- arg) t))
 
 (defun dired-toggle-marks ()
   "Toggle marks: marked files become unmarked, and vice versa.
-- 
2.10.2

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In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.3)
 of 2016-11-23
Repository revision: afe2997119a5e6b108851f2e236037da1d4acef2