From: Lars Ingebrigtsen <larsi@gnus.org>
Date: Mon, 15 Nov 2021 06:38:07 +0000 (+0100)
Subject: Fix outline-cycle-buffer issue in `C-h b' buffers
X-Git-Tag: emacs-29.0.90~2852^2~274
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=2a3c8f3d2e8a9b58c8b6c93168096ed096bcc5d6;p=emacs.git

Fix outline-cycle-buffer issue in `C-h b' buffers

* lisp/outline.el (outline--fix-up-all-buttons): Fix issue when
called after collapsing a buffer (bug#51855).
---

diff --git a/lisp/outline.el b/lisp/outline.el
index cefb8117035..9a2e4324b22 100644
--- a/lisp/outline.el
+++ b/lisp/outline.el
@@ -1014,7 +1014,10 @@ If non-nil, EVENT should be a mouse event."
   (when outline-minor-mode-use-buttons
     (outline-map-region
      (lambda ()
-       (if (eq (outline--cycle-state) 'show-all)
+       ;; `outline--cycle-state' will fail if we're in a totally
+       ;; collapsed buffer -- but in that case, we're not in a
+       ;; `show-all' situation.
+       (if (eq (ignore-errors (outline--cycle-state)) 'show-all)
            (outline--insert-open-button)
          (outline--insert-close-button)))
      (or from (point-min)) (or to (point-max)))))