-will be addressed to all recipients of the source message."
-
-;; In current emacs (24.3) select-active-regions is set to t by
-;; default. The reply insertion code sets the region to the quoted
-;; message to make it easy to delete (kill-region or C-w). These two
-;; things combine to put the quoted message in the primary selection.
-;;
-;; This is not what the user wanted and is a privacy risk (accidental
-;; pasting of the quoted message). We can avoid some of the problems
-;; by let-binding select-active-regions to nil. This fixes if the
-;; primary selection was previously in a non-emacs window but not if
-;; it was in an emacs window. To avoid the problem in the latter case
-;; we deactivate mark.
-
- (let ((sender
- (when prompt-for-sender
- (notmuch-mua-prompt-for-sender)))
+will be addressed to all recipients of the source message. If
+DUPLICATE is non-nil, based the reply on that duplicate file"
+ ;; `select-active-regions' is t by default. The reply insertion code
+ ;; sets the region to the quoted message to make it easy to delete
+ ;; (kill-region or C-w). These two things combine to put the quoted
+ ;; message in the primary selection.
+ ;;
+ ;; This is not what the user wanted and is a privacy risk (accidental
+ ;; pasting of the quoted message). We can avoid some of the problems
+ ;; by let-binding select-active-regions to nil. This fixes if the
+ ;; primary selection was previously in a non-emacs window but not if
+ ;; it was in an emacs window. To avoid the problem in the latter case
+ ;; we deactivate mark.
+ (let ((sender (and prompt-for-sender
+ (notmuch-mua-prompt-for-sender)))