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From: Juri Linkov <juri@linkov.net>
Newsgroups: gmane.emacs.devel
Subject: Re: dired: make dired-maybe-insert-subdir always skip trivial files
Date: Thu, 25 Dec 2014 22:18:03 +0200
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> This way, (unless ...) will be evaluated even if `dired-goto-subdir'
> returned nil.

I thought that dired-subdir-hidden-p will handle this situation,
but then actually I see no problem in using t always.