package-autoremove如何确定要删除的软件包？

在更新当前软件包以运行package-autoremove时，经常会提示我，该软件包声称要删除过时或不必要的软件包。但是，它似乎总是删除（以及那些过时的软件包）我确实使用的两个软件包（即aurora-theme，我当前选择的主题和dired +）。

恐怕对于Emacs-Lisp来说我还是一个新手，我只是想知道是否有办法阻止软件包自动删除删除这些软件包，因此我不需要继续重新安装它们。

来源在这里：https : //github.com/emacs-mirror/emacs/blob/master/lisp/emacs-lisp/package.el#L2113。

它会删除所有不在“ packages-selected-packages”或某个依赖项中的软件包。

(defun package-autoremove ()
"Remove packages that are no more needed.
        Packages that are no more needed by other packages in
        `package-selected-packages' and their dependencies
        will be deleted."
(interactive)
;; If `package-selected-packages' is nil, it would make no sense to
;; try to populate it here, because then `package-autoremove' will
;; do absolutely nothing.
(when (or package-selected-packages
            (yes-or-no-p
            (format-message
            "`package-selected-packages' is empty! Really remove ALL packages? ")))
    (let ((removable (package--removable-packages)))
    (if removable
        (when (y-or-n-p
                (format "%s packages will be deleted:\n%s, proceed? "
                        (length removable)
                        (mapconcat #'symbol-name removable ", ")))
            (mapc (lambda (p)
                    (package-delete (cadr (assq p package-alist)) t))
                removable))
        (message "Nothing to autoremove")))))

(defun package--removable-packages ()
  "Return a list of names of packages no longer needed.
These are packages which are neither contained in
`package-selected-packages' nor a dependency of one that is."
  (let ((needed (cl-loop for p in package-selected-packages
                         if (assq p package-alist)
                         ;; `p' and its dependencies are needed.
                         append (cons p (package--get-deps p)))))
    (cl-loop for p in (mapcar #'car package-alist)
             unless (memq p needed)
             collect p)))