Consider 'dired-kill-when-opening-new-dired-buffer' in mouse clicks

* lisp/dired.el (dired-mouse-find-file): Honor the value of
'dired-kill-when-opening-new-dired-buffer'.  (Bug#64079)

lisp/dired.el

@@ -2765,17 +2765,24 @@ This kills the Dired buffer, then visits the current line's file or directory."
 The optional arguments FIND-FILE-FUNC and FIND-DIR-FUNC specify
 functions to visit the file and directory, respectively. If
 omitted or nil, these arguments default to `find-file' and `dired',
-respectively."
+respectively. If `dired-kill-when-opening-new-dired-buffer' is
+non-nil, FIND-DIR-FUNC defaults to `find-alternate-file' instead,
+so that the original Dired buffer is not kept."
  (interactive "e")
  (or find-file-func (setq find-file-func 'find-file))
- (or find-dir-func (setq find-dir-func 'dired))
  (let (window pos file)
  (save-excursion
  (setq window (posn-window (event-end event))
  pos (posn-point (event-end event)))
  (if (not (windowp window))
  (error "No file chosen"))
  (set-buffer (window-buffer window))
+ (unless find-dir-func
+ (setq find-dir-func
+ (if (and dired-kill-when-opening-new-dired-buffer
+ (< (length (get-buffer-window-list)) 2))
+ 'find-alternate-file
+ 'dired)))
  (goto-char pos)
  (setq file (dired-get-file-for-visit)))
  (if (file-directory-p file)