Feedreader 3

The unread count is not stable and should be improved. I found a bug that is easily reproductible.
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Step1: Add a new folder, F1
Step2: add a new folder, F2. Of course, F1 and F2 are empty
Step3: Move F2 into F1
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Bug: FR show 1066 unread articles for F1 (but F1 is empty). 1066 happens to be the total number of unread feeds. Being in "Hide read feeds" mode, I still can see F1, this shouldn't be the case.
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Side note: "Refresh unread article count" does *not* solve the issue. Running the backup utility and restarting FR does not solve the issue either. F1 is still displayed with 1066 unread count.
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