(setq file (concat dir file))
(push file candidates)
(when (file-directory-p file)
(push file directories)))
(dolist (directory (reverse directories))
;; Add one level of children.
(setq file (concat dir file))
(push file candidates)
(when (file-directory-p file)
(push file directories)))
(dolist (directory (reverse directories))
;; Add one level of children.