bug#45879: 28.0.50; [PATCH] missing defvar for keymap-name-history

[James N. V. Cash]

It seems that the new describe-keymaps function in help-fns.el is
missing a defvar for keymap-name-history. This results in an error
when using, e.g. Helm as the completing-read function.

The attached patch adds the defvar to help-fns.el.

---
 lisp/help-fns.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index d559221a82..7be2826361 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -76,6 +76,9 @@ help-definition-prefixes
   ;; costly, really).
   "Radix-tree representation replacing `definition-prefixes'.")
 
+(defvar keymap-name-history nil
+  "History for input to `describe-keymap'.")
+
 (defun help-definition-prefixes ()
   "Return the up-to-date radix-tree form of `definition-prefixes'."
   (when (> (hash-table-count definition-prefixes) 0)
-- 
2.25.1