my @exp = sort($long_reply_mid, 'root@s', 'last@s', $long_mid);
@res = filter_mids($t);
is_deeply(\@res, \@exp, "get_thread works");
my @exp = sort($long_reply_mid, 'root@s', 'last@s', $long_mid);
@res = filter_mids($t);
is_deeply(\@res, \@exp, "get_thread works");