Fix the bogus change made 13 years ago (bug#27084)

* lisp/gnus/gnus-sum.el (gnus-summary-toggle-header):
Fix the way to test if there is no visible header (bug#27084).

1 files changed, 5 insertions, 2 deletions

diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 9bdd0c66f56..f2e51fb225f 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -9780,8 +9780,11 @@ If ARG is a negative number, hide the unwanted header lines."
              (inhibit-point-motion-hooks t)
              (hidden (if (numberp arg)
                          (>= arg 0)
-                       (or (not (looking-at "[^ \t\n]+:"))
-                           (gnus-article-hidden-text-p 'headers))))
+                       (or
+                        ;; The case where there's no visible header
+                        ;; that matches `gnus-visible-headers'.
+                        (looking-at "\n?\\'")
+                        (gnus-article-hidden-text-p 'headers))))
              s e)
         (delete-region (point-min) (point-max))
         (with-current-buffer gnus-original-article-buffer