Variable: dired-clean-confirm-killing-deleted-buffers
dired-clean-confirm-killing-deleted-buffers is a customizable variable
defined in dired.el.gz.
Value
t
Documentation
If nil, don't ask whether to kill buffers visiting deleted files.
This variable was added, or its default value changed, in Emacs 26.1.
Probably introduced at or before Emacs version 26.1.
Source Code
;; Defined in /usr/src/emacs/lisp/dired.el.gz
(defcustom dired-clean-confirm-killing-deleted-buffers t
"If nil, don't ask whether to kill buffers visiting deleted files."
:type 'boolean
:group 'dired
:version "26.1")