Stop making Thunderbird mark deleted messages as read

EE <[email protected]>
Newsgroups gmane.comp.mozilla.wishlist
Message-ID <[email protected]> 
Thunderbird 3 is marking deleted email messages as read whether they 
have been read or not.  I see no logical reason why that should happen, 
and I would like to have some way to prevent that.  I think the Deleted 
(Trash) folder should indicate any unread messages that it contains, and 
they have to be marked as unread for it to do that.
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