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File gnus-group-get-new-news-this-group.patch of Package emacsdev

Index: emacs-25.0.90/lisp/gnus/gnus-group.el
===================================================================
--- emacs-25.0.90.orig/lisp/gnus/gnus-group.el
+++ emacs-25.0.90/lisp/gnus/gnus-group.el
@@ -4109,9 +4109,14 @@ If DONT-SCAN is non-nil, scan non-activa
       (gnus-group-remove-mark group)
       ;; Bypass any previous denials from the server.
       (gnus-remove-denial (setq method (gnus-find-method-for-group group)))
-      (if (or (and (not dont-scan)
-		   (gnus-request-group-scan group (gnus-get-info group)))
-	      (gnus-activate-group group (if dont-scan nil 'scan) nil method))
+      (if (if (and (not dont-scan)
+		   ;; Prefer request-group-scan if the backend supports it.
+		   (gnus-check-backend-function 'request-group-scan group))
+	      (progn
+		;; Ensure that the server is already open.
+		(gnus-activate-group group nil nil method)
+		(gnus-request-group-scan group (gnus-get-info group)))
+	    (gnus-activate-group group (if dont-scan nil 'scan) nil method))
 	  (let ((info (gnus-get-info group))
 		(active (gnus-active group)))
 	    (when info