Clarify warning about unknown articles in Gnus

* lisp/gnus/gnus-sum.el (gnus-summary-mark-article-as-unread)
(gnus-mark-article-as-unread): Clarify warning (bug#34990).

diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 7f6b936383c3288499c1b2f5a08e8d65e37383a0..019b47d67ef7ab8cb44f53ff63e6a794c642b1d4 100644 (file)
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -11153,7 +11153,7 @@ If NO-EXPIRE, auto-expiry will be inhibited."
        t
       (if (<= article 0)
          (progn
-           (gnus-error 1 "Can't mark negative article numbers")
+           (gnus-error 1 "Gnus doesn't know the article number; can't mark")
            nil)
        (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked))
        (setq gnus-newsgroup-spam-marked
@@ -11326,7 +11326,7 @@ If NO-EXPIRE, auto-expiry will be inhibited."
   (let ((mark (or mark gnus-ticked-mark)))
     (if (<= article 0)
        (progn
-         (gnus-error 1 "Can't mark negative article numbers")
+         (gnus-error 1 "Gnus doesn't know the article number; can't mark")
          nil)
       (setq gnus-newsgroup-marked (delq article gnus-newsgroup-marked)
            gnus-newsgroup-spam-marked (delq article gnus-newsgroup-spam-marked)