helpful--heading: propertize newline as well, enabling `:extend t`

Prior to this commit, setting attribute :extend of the face
helpful--heading to t did not take any effect. This is fixed by this
commit by propertizing the newline right after the heading as well.

1 files changed, 1 insertions, 1 deletions

diff --git a/helpful.el b/helpful.el
index 3c229b1..aeb5f84 100644
--- a/helpful.el
+++ b/helpful.el
@@ -167,7 +167,7 @@ can make Helpful very slow.")
 
 (defun helpful--heading (text)
   "Propertize TEXT as a heading."
-  (format "%s\n" (propertize text 'face 'helpful-heading)))
+  (propertize (concat text "\n") 'face 'helpful-heading))
 
 (defun helpful--format-closure (sym form)
   "Given a closure, return an equivalent defun form."