Fix large archive operations that covers messages in the store with
unfetched headers. Commit e5ad877af5 ("msgstore: fetch missing headers
in visual mode") fixed this for the visual selection mode but omitted
the case when 'mark -a' is used to mark all messages.
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>