RE: dired-hide-details-mode have no effect suddenly

[Drew Adams <drew.adams@oracle.com>]

> > Do you see the same thing if you start Emacs using `emacs -Q'
> 
> I don's see. Loaded magit, zerodark theme and maybe something else and
> it didn't happen.

Then recursively bisect your init file to find the culprit.

You can use command `comment-region' to comment or (with `C-u')
uncomment a selection of text.  Use it to comment out 1/2, then
3/4, 7/8, ... of your init file.  Narrow down the code you use,
to find the problem.

> > Do you perhaps use library `dired-details+.el'? If so, and if
> 
> not what I know. I see a readme in my elpa directory,
> "dired-details+-readme.txt" but nothing else. I don't know what it's
> doing there, but anyway. It informs me it's not needed since emacs 24.4+

That's a misreading of that readme.  What it says is that Emacs
24.4 and later provide `dired-hide-details-mode'.  If all you
want is what that offers then you do not need any 3rd-party
library.

But if you want what `dired-details+.el' provides and you have
Emacs 24.4 or later then you can get those additional features
from Dired+ (library `dired+.el').

I've reworded that part of the readme to help prevent misreading:

NOTE: If you use Emacs 24.4 or later, and if you use library
      `dired+.el', then you do not need this library or library
      `dired-details.el'.

      Instead, you can use `dired-hide-details-mode'.  Library
      `dired+.el' enhances `dired-hide-details-mode' to give it
      the same features as `dired-details+.el' provides.  In
      that case, use `(require 'dired+.el)', and use option
      `diredp-hide-details-propagate-flag' instead of option
      `dired-details-propagate-flag'.

> I report back if I can be more specific, it feels like there
> must be a package doing something.

Again, bisect your init file, to find out what you are doing
that causes the behavior you don't like.