gnus-summary-select-article-buffer: Don't re-render existing article

* lisp/gnus/gnus-sum.el (gnus-summary-select-article-buffer):
Don't re-render existing article.

1 files changed, 3 insertions, 2 deletions

diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 2631514e425..ae13e7157d7 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -7045,8 +7045,9 @@ buffer."
   (interactive)
   (if (not (gnus-buffer-live-p gnus-article-buffer))
       (error "There is no article buffer for this summary buffer")
-    (unless (get-buffer-window gnus-article-buffer)
-      (gnus-summary-show-article))
+    (or (get-buffer-window gnus-article-buffer)
+        (eq gnus-current-article (gnus-summary-article-number))
+        (gnus-summary-show-article))
     (gnus-configure-windows
      (if gnus-widen-article-window
          'only-article