From: Daiki Ueno <ueno@gnu.org>
Date: Sun, 15 Apr 2018 14:11:46 +0000 (+0200)
Subject: Divert to call `gnus-activate-group' with the SCAN argument set
X-Git-Tag: emacs-27.0.90~5191
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=c3ca885f4931a3b17b7e826cc866550d264d685a;p=emacs.git

Divert to call `gnus-activate-group' with the SCAN argument set

* lisp/gnus/gnus-group.el (gnus-group-get-new-news-this-group):
Divert to call `gnus-activate-group' with the SCAN argument set,
if request-group-scan is not defined for the backend.  Ensure that
the server is open when calling `gnus-request-group-scan'
(bug#22649).
---

diff --git a/lisp/gnus/gnus-group.el b/lisp/gnus/gnus-group.el
index 1a3646800e9..d1f258fd92a 100644
--- a/lisp/gnus/gnus-group.el
+++ b/lisp/gnus/gnus-group.el
@@ -4105,9 +4105,14 @@ If DONT-SCAN is non-nil, scan non-activated groups as well."
       (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