get_categories allows custom taxos, get_category doesn't

[Malaiac]

get_categories('type=link') works with custom taxonomies (since ​http://trac.wordpress.org/ticket/7427 ).
get_category('... ?') doesn't.
get_category > get_term($category,'category');

Because of that, all category dependent functions, like wp_list_categories and such, are broken when working with non post categories. get_category doesn't even work with link categories.

[wojtek.szkutnik]

Hm, shouldn't all these functions use wp_get_args instead of separate arguments?

[wonderboymusic]

This is harmless, but might not be necessary. Let us discuss.

[nacin]

It might make more sense to convert all uses of get_category() to get_term(), in functions like wp_list_categories() that are generic and take a taxonomy argument. Otherwise this change doesn't actually help, unless you use the filter, which is very confusing.

[wonderboymusic]

It might make more sense to convert all uses of get_category() to get_term()

Yes, and it actually removes the need for _make_cat_compat() in the functions that are only looking for one property. .3.diff​ does this.

[wonderboymusic]

In 25662:

Rather than adding a taxonomy arg to get_category(), convert all uses of get_category() in core to get_term(). By doing so, we negate the need to call _make_cat_compat() in a few places that are only looking for a single property.

Fixes #8722.