bug#28807: 25.2; dired-actual-switches` and .dir-locals.el

[leo <dev@halloleo.hailmail.net>]

Setup
=====

* Create a directory `mydir` somewhere accessible to you.
* Create some files with different timestamp and different names in there.
* Craete a `.dir-locals.el` file in teher with the follwoing content:

    ;;; Directory Local Variables
    ;;; For more information see (info "(emacs) Directory Variables")
    
    ((dired-mode .
      ((dired-actual-switches . "-laht")
       (subdirs . nil))))
       
* Create a subirectory `subdir` inside `mydir`
* Create some files with different timestamp and different names in there.

Bug 1: .dir-locals.el not applied the first time
================================================

* Launch `emacs -Q`
* Open `mydir` via `M-x find-file` as a dired buffer
* Observe that `mydir` is **not** in date order sorted
* Kill `mydir` buffer.
* Open again `mydir` via `M-x find-file` as a dired buffer
* Observe that `mydir` **is**  in date order sorted (as it should be)

Bug 2: (subdirs . nil) rule not obeyed
======================================

* Stay in that `emacs -Q` session
* Kill `mydir` buffer.
* Open `mydir/subdir` via `M-x find-file` as a dired buffer
* Observe that `mydir` **is**  in date order sorted (as it **not** should be)

Hope this helps!

* * *

In GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.23)
 of 2017-09-01 built on ACCRAD01
Windowing system distributor 'MobaXterm', version 11.0.10605000
System Description:	Oracle Linux Server release 6.9

Configured features:
XPM JPEG TIFF GIF PNG SOUND GPM DBUS GCONF NOTIFY LIBSELINUX LIBXML2
FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Dired by date

Minor modes in effect:
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  auto-revert-mode: t
  async-bytecomp-package-mode: t
  helm-autoresize-mode: t
  savehist-mode: t
  shell-dirtrack-mode: t
  delete-selection-mode: t
  google-this-mode: t
  recentf-mode: t
  dired-omit-mode: t
  winner-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Omitted 2 lines.
Mark set
Reverting buffer ‘devel’.
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Directory /home/broleo/tmp/emacs-test/

Load-path shadows:
None found.

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