Make outline-blank-line into defcustom

* lisp/outline.el (outline-blank-line): Make into defcustom
(bug#54095).

Copyright-paperwork-exempt: yes

diff --git a/lisp/outline.el b/lisp/outline.el
index 4dbbaa26a0b94f8fddca7acb578dd5518535caa4..696d109f1eeabe983510229234052fe20f461aca 100644 (file)
--- a/lisp/outline.el
+++ b/lisp/outline.el
@@ -312,8 +312,11 @@ data reflects the `outline-regexp'.")
 (defvar outline-mode-hook nil
   "This hook is run when outline mode starts.")
 
-(defvar outline-blank-line nil
-  "Non-nil means to leave unhidden blank line before heading.")
+(defcustom outline-blank-line nil
+  "Non-nil means to leave an unhidden blank line before headings."
+  :type 'boolean
+  :safe #'booleanp
+  :version "22.1")
 
 ;;;###autoload
 (define-derived-mode outline-mode text-mode "Outline"