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-rw-r--r--lisp/mail/rmail.el8
1 files changed, 8 insertions, 0 deletions
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 29460cc20f5..9f95b62d870 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -2723,6 +2723,12 @@ See also `unrmail-mbox-format'."
:version "24.4"
:group 'rmail-files)
+(defcustom rmail-show-message-set-modified nil
+ "If non-nil, displaying an unseen message marks the Rmail buffer as modified."
+ :type 'boolean
+ :group 'rmail
+ :version "28.1")
+
(defun rmail-show-message-1 (&optional msg)
"Show message MSG (default: current message) using `rmail-view-buffer'.
Return text to display in the minibuffer if MSG is out of
@@ -2750,6 +2756,8 @@ The current mail message becomes the message displayed."
;; Mark the message as seen, but preserve buffer modified flag.
(let ((modiff (buffer-modified-p)))
(rmail-set-attribute rmail-unseen-attr-index nil)
+ (and rmail-show-message-set-modified
+ (setq modiff t))
(unless modiff
(restore-buffer-modified-p modiff)))
;; bracket the message in the mail