+ (if (gnus-check-backend-function 'retrieve-groups group)
+ ;; if server support gnus-retrieve-groups we push
+ ;; the group onto retrievegroups for later checking
+ (if (assoc method retrieve-groups)
+ (setcdr (assoc method retrieve-groups)
+ (cons group (cdr (assoc method retrieve-groups))))
+ (push (list method group) retrieve-groups))
+ ;; hack: `nnmail-get-new-mail' changes the mail-source depending
+ ;; on the group, so we must perform a scan for every group
+ ;; if the users has any directory mail sources.
+ ;; hack: if `nnmail-scan-directory-mail-source-once' is non-nil,
+ ;; for it scan all spool files even when the groups are
+ ;; not required.
+ (if (and
+ (or nnmail-scan-directory-mail-source-once
+ (null (assq 'directory
+ (or mail-sources
+ (if (listp nnmail-spool-file)
+ nnmail-spool-file
+ (list nnmail-spool-file))))))
+ (member method scanned-methods))
+ (setq active (gnus-activate-group group))
+ (setq active (gnus-activate-group group 'scan))
+ (push method scanned-methods))
+ (when active
+ (gnus-close-group group))))))