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public abstract async void open_async(bool readonly, Cancellable? cancellable = null) throws Error;
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public abstract async void close_async(Cancellable? cancellable = null) throws Error;
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public abstract async Gee.List<Geary.Email>? list_email_async(int low, int count,
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Geary.Email.Field required_fields, Folder.ListFlags flags, Cancellable? cancellable = null)