+ (beginning-of-line)
+ (setq beg (point))
+ ;; Find first line of the paragraph.
+ (if not-break
+ (while (and (not (eobp))
+ (not (looking-at message-cite-prefix-regexp))
+ (looking-at paragraph-start))
+ (forward-line 1)))
+ ;; Find the prefix
+ (when (looking-at message-cite-prefix-regexp)
+ (setq quoted (match-string 0))
+ (goto-char (match-end 0))
+ (looking-at "[ \t]*")
+ (setq leading-space (match-string 0)))
+ (if (and quoted
+ (not not-break)
+ (< (- point beg) (length quoted)))
+ ;; break in the cite prefix.
+ (setq quoted nil
+ end nil))
+ (if quoted
+ (progn
+ (forward-line 1)
+ (while (and (not (eobp))
+ (not (looking-at paragraph-separate))
+ (looking-at message-cite-prefix-regexp)
+ (equal quoted (match-string 0)))
+ (goto-char (match-end 0))
+ (looking-at "[ \t]*")
+ (if (> (length leading-space) (length (match-string 0)))
+ (setq leading-space (match-string 0)))
+ (forward-line 1))
+ (setq end (point))
+ (goto-char beg)
+ (while (and (if (bobp) nil (forward-line -1) t)
+ (not (looking-at paragraph-start))
+ (looking-at message-cite-prefix-regexp)
+ (equal quoted (match-string 0)))
+ (setq beg (point))
+ (goto-char (match-end 0))
+ (looking-at "[ \t]*")
+ (if (> (length leading-space) (length (match-string 0)))
+ (setq leading-space (match-string 0)))))
+ (while (and (not (eobp))
+ (not (looking-at paragraph-separate))
+ (not (looking-at message-cite-prefix-regexp)))
+ (forward-line 1))
+ (setq end (point))
+ (goto-char beg)
+ (while (and (if (bobp) nil (forward-line -1) t)
+ (not (looking-at paragraph-start))
+ (not (looking-at message-cite-prefix-regexp)))
+ (setq beg (point))))