taxonomy is a powerful tool than can be used not only for category, post_tag or link_category. I test it to develop multilingual set (theme + plugin) and create language and dictionary taxonomies... Some small bugs was detected (#5230, #5240). To reuse standard stable scripts, it will be good if sorting can be set not only for count, name or term_id but also for slug and why not for term_group.
current code
if ( 'count' == $orderby )
$orderby = 'tt.count';
else if ( 'name' == $orderby )
$orderby = 't.name';
else
$orderby = 't.term_id';
expected code
if ( 'count' == $orderby )
$orderby = 'tt.count';
else if ( 'name' == $orderby )
$orderby = 't.name';
else if ( 'slug' == $orderby )
$orderby = 't.slug';
else if ( 'term_group' == $orderby )
$orderby = 't.term_group';
else
$orderby = 't.term_id';
Hope it will be useful for other developers.
