if I set the options
- Automatically mark identical news as read
- Chenge behaviour of action "Next Unread News"
Tools -> Options -> Feeds-> Reading
all new unread news are set to read not only the duplicates.
As you told me this should be the way to mark duplicates as read there seems to be a bug in this.
I would expect the following behaviour
- A news without duplicates should be marked as unread
- If there are duplicates for a news at least one should be marked as unread
Please have a look!