private static (string id, MailboxFlags) CalculateFlagsFromFileName(string fileName)
{
fileName = Path.GetFileName(fileName);
// ReSharper disable once AssignNullToNotNullAttribute
Match match = s_maildirPattern.Match(fileName);
if (!match.Success)
{
return(fileName, MailboxFlags.None);
}
return(match.Groups[1].Value, ImapHelper.GetFlagsFromMailDir(match.Groups[2].Value));
}