Remove duplicate entries.

[vincode-io]

Hi, love the app! So simple and fast to review my subscriptions. A feature I would find useful would be a way to filter out duplicates since I seem to have created a few after splitting up a category and moving my OPML around between different apps.

Originally posted by @dndrcat in #1 (comment)

[vincode-io]

Hi @dndrcat! I've created a separate issue to track this feature request.

The biggest obstacle that I see is determining which feed should be filtered out. One idea I had was to provide a column that denotes if the feed is duplicated. That way you could scan with your eye down the listing and then delete the the specific feed you want removed.

Do you have any other ideas on how we can filter the feeds for duplicates?

A column showing duplicate entries would be great! Another approach could be to add a menu option to "Show duplicates" similar to what iTunes used to have. When activated, the list is filtered so only duplicate entries and their location in the hierarchy is visible.