Introduce remove_post_status

[kovshenin]

Plugins and themes should be able to remove the default post statuses defined by core.

[sirzooro]

IMHO this should go to #12706.

[kovshenin]

Replying to sirzooro: Yeah, just trying to break that ticket down into smaller pieces, that's all ;)

[sirzooro]

Replying to kovshenin:

Replying to sirzooro: Yeah, just trying to break that ticket down into smaller pieces, that's all ;)

OK, I see :)

[danielbachhuber]

There are probably some core statuses (e.g. 'Trash') we'll need to protect from removal to avoid breaking all the things.

[SergeyBiryukov]

Perhaps unregister_post_status() would be a better name, for consistency with unregister_taxonomy() (suggested in #11058).

[nacin]

Removing core post statuses, for core post types, is likely going to be very prone to breakage, which is why we have yet to introduce an unregistration for taxonomies or post types.

A better way to approach this is to segment post statuses against individual post types. Really, you probably shouldn't be able to remove a post status at all, only remove it for individual post types. Should post statuses even be shared against a post type? That can cause problems when you might want certain behavior for "active" on one type but different behavior for another type. Worse when two plugins both want an "active" status for their own post types — as they should be allowed to do.

[kovshenin]

I also think you shouldn't be able to completely remove post statuses, types and taxonomies, but rather unregister them from object types, which I think would cover most of the use cases. So perhaps we should add unregister_post_status_for_object_type instead.

unregister_taxonomy_for_object_type was also discussed in #11058.

[kovshenin]

Related #11375

[mordauk]

I'll throw my two cents in and agree with @kovshenin and @nacin that statuses should be removed on a per-object basis.