(Info-tagify): Avoid 1-off error in position of a tag.

1 files changed, 5 insertions, 3 deletions

diff --git a/lisp/informat.el b/lisp/informat.el
index 3930378c5df..5a861ed18ba 100644
--- a/lisp/informat.el
+++ b/lisp/informat.el
@@ -48,9 +48,11 @@
                   (case-fold-search t)
                   list)
               (while (search-forward "\n\^_" nil t)
-                (forward-line 1)
-                (let ((beg (point)))
-                  (forward-line 1)
+                ;; We want the 0-origin character position of the ^_.
+                ;; That is the same as the Emacs (1-origin) position
+                ;; of the newline before it.
+                (let ((beg (match-beginning 0)))
+                  (forward-line 2)
                   (if (re-search-backward regexp beg t)
                       (setq list
                             (cons (list (buffer-substring