Pass buffer as object in gnus-highlight-selected-tree

* lisp/gnus/gnus-salt.el (gnus-highlight-selected-tree): Correctly
pass buffer object instead of string.  (Bug#75557)

(cherry picked from commit d6dd9dd066e8db665b5c48a4b8fde4db1753e6ad)

diff --git a/lisp/gnus/gnus-salt.el b/lisp/gnus/gnus-salt.el
index e1d9f8bf188c9b812bab4e3acc0d632bb846c9dc..021a03d4b16e17746a1ac60e23725ef2c3bae9e8 100644 (file)
--- a/lisp/gnus/gnus-salt.el
+++ b/lisp/gnus/gnus-salt.el
@@ -808,7 +808,7 @@ it in the environment specified by BINDINGS."
 
 (defun gnus-highlight-selected-tree (article)
   "Highlight the selected article in the tree."
-  (when (buffer-live-p gnus-tree-buffer)
+  (when (buffer-live-p (get-buffer gnus-tree-buffer))
     (let ((buf (current-buffer))
          region)
       (set-buffer gnus-tree-buffer)