bug#37916: GNUS: wrong item selected in gnus-thread-hide-subtree customization

[Sergey Organov <sorganov@gmail.com>]

The "Non-nil" defcustom item is selected in customization buffer when
actual value of the gnus-thread-hide-subtree is 'nil.

-- 8< --

Fix gnus-thread-hide-subtree defcustom

* lisp/gnus/gnus-sum.el (gnus-thread-hide-subtree): fix order of
items to prevent first 'sexp' from matching 'nil, that caused
"Non-nil" item to be selected in customization buffer when actual
variable value is 'nil.
---
 lisp/gnus/gnus-sum.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index b5d7448..1970465 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -332,11 +332,11 @@ This can be a predicate specifier which says which threads to hide.
 If threads are hidden, you have to run the command
 `gnus-summary-show-thread' by hand or select an article."
   :group 'gnus-thread
-  :type '(radio (sexp :format "Non-nil\n"
+  :type '(radio (const nil)
+		(sexp :format "Non-nil\n"
 		      :match (lambda (widget value)
 			       (not (or (consp value) (functionp value))))
 		      :value t)
-		(const nil)
 		(sexp :tag "Predicate specifier")))
 
 (defcustom gnus-thread-hide-killed t
-- 
2.1.4