+ (progn
+ ;; If the message buffer has lived in a dedicated window,
+ ;; `kill-buffer' has killed the frame. Thus the
+ ;; `yes-or-no-p' may show up in a lowered frame. Make sure
+ ;; that the user can see the question by raising the
+ ;; current frame:
+ (raise-frame)
+ (yes-or-no-p (format "Remove the backup file%s? "
+ (if modified " too" "")))))