[sylpheed:32006] folder summary not updated

[Randy Dunlap]

minor bug report:

I have a few folders which I leave in "Unread" display selection mode.
If one of these folders has new messages, the folder summary on the
bottom right gray area shows
	N new, M unread, P total (S.T MB)

After I read any number of new messages in these folders, the "new"
count remains the same, i.e., it is not updated.  For other folders
(displaying All messages in the folders), the count is updated.
I can force the count to be updated by reselecting the "Unread"
choice in the pull-down menu, but that shouldn't be required.

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~Randy