- (unless (eq gnus-fetch-old-headers 'invisible)
- (gnus-message 5 "Fetching headers for %s..." gnus-newsgroup-name)
- ;; Retrieve the headers and read them in.
- (if (eq (if (numberp limit)
- (gnus-retrieve-headers
- (list (min
- (+ (mail-header-number
- (gnus-summary-article-header))
- limit)
- gnus-newsgroup-end))
- gnus-newsgroup-name (* limit 2))
- ;; gnus-refer-thread-limit is t, i.e. fetch _all_
- ;; headers.
- (gnus-retrieve-headers (list gnus-newsgroup-end)
- gnus-newsgroup-name limit))
- 'nov)
- (gnus-build-all-threads)
- (error "Can't fetch thread from back ends that don't support NOV"))
- (gnus-message 5 "Fetching headers for %s...done" gnus-newsgroup-name))
+ (setq gnus-newsgroup-headers
+ (gnus-merge
+ 'list gnus-newsgroup-headers
+ (if (gnus-check-backend-function
+ 'request-thread gnus-newsgroup-name)
+ (gnus-request-thread id)
+ (let* ((last (if (numberp limit)
+ (min (+ (mail-header-number
+ (gnus-summary-article-header))
+ limit)
+ gnus-newsgroup-highest)
+ gnus-newsgroup-highest))
+ (subject (gnus-simplify-subject
+ (mail-header-subject
+ (gnus-summary-article-header))))
+ (refs (split-string (or (mail-header-references
+ (gnus-summary-article-header))
+ "")))
+ (gnus-parse-headers-hook
+ (lambda () (goto-char (point-min))
+ (keep-lines
+ (regexp-opt (append refs (list id subject)))))))
+ (gnus-fetch-headers (list last) (if (numberp limit)
+ (* 2 limit) limit) t)))
+ 'gnus-article-sort-by-number))