Variable: dired-kill-when-opening-new-dired-buffer
dired-kill-when-opening-new-dired-buffer is a customizable variable
defined in dired.el.gz.
Value
nil
Documentation
If non-nil, kill the current buffer when selecting a new directory.
This variable was added, or its default value changed, in Emacs 28.1.
Probably introduced at or before Emacs version 28.1.
Source Code
;; Defined in /usr/src/emacs/lisp/dired.el.gz
(defcustom dired-kill-when-opening-new-dired-buffer nil
"If non-nil, kill the current buffer when selecting a new directory."
:type 'boolean
:group 'dired
:version "28.1")