org: Do not save org-contacts-files in desktop session

.emacs.d/lisp/init-org.el

@@ -33,6 +33,10 @@
 
 (when (require 'org-contacts nil t)
   (let ((contacts "~/personal/contacts/contacts.org"))
-    (when (file-exists-p contacts) (setq org-contacts-files (list contacts)))))
+    (when (file-exists-p contacts)
+      ;; When used to auto-complete e-mail addresses, the file is automatically
+      ;; loaded.  The buffer usually need not be restored by a desktop session.
+      (setq desktop-files-not-to-save (concat (substring desktop-files-not-to-save 0 -2) "\\|" (regexp-quote (expand-file-name contacts)) "\\)"))
+      (setq org-contacts-files (list contacts)))))
 
 (provide 'init-org)