Only show feeds with unread articles

[erwinlansing]

With a large number of subscriptions, including lots of subscriptions that infrequently post, it would be nice to be able to only view subscriptions, that have unread articles. Currently, the only options seem to be to use All articles and filter for Unread, but that list is not sorted by subscription or category. Otherwise, you can scroll through the very long list of subscriptions (as in longer than screen height) to hunt for the ones that have number next to them for unread articles. Only showing categories and subscriptions with unread articles would give a much better overview.