(desktop-buffers-not-to-save): Remove TAGS from the default value.

(desktop-modes-not-to-save): Add tags-table-mode to the default value.

lisp/desktop.el

@@ -293,9 +293,8 @@ modes are restored automatically; they should not be listed here."
 
 ;; We skip .log files because they are normally temporary.
 ;;         (ftp) files because they require passwords and whatnot.
-;;         TAGS files to save time (tags-file-name is saved instead).
 (defcustom desktop-buffers-not-to-save
-  "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
+  "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\)$"
   "Regexp identifying buffers that are to be excluded from saving."
   :type 'regexp
   :group 'desktop)
@@ -307,7 +306,9 @@ modes are restored automatically; they should not be listed here."
   :type 'regexp
   :group 'desktop)
 
-(defcustom desktop-modes-not-to-save nil
+;; We skip TAGS files to save time (tags-file-name is saved instead).
+(defcustom desktop-modes-not-to-save
+  '(tags-table-mode)
   "List of major modes whose buffers should not be saved."
   :type '(repeat symbol)
   :group 'desktop)