Currently only the Accounts activity uses the new count.
While working on this I realized that the unread/flagged search for
accounts currently looks for unread/flagged messages in all folders, not
all displayable folders without special folders (Trash, Spam, Outbox,
Sent, Drafts) like we used to.
Also, the "All messages" search currently doesn't limit the search to
searchable folders like it is supposed to.
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