Removing Last Tag in Quick Edit

[zachware]

In 2.9-beta-2 create a post with a tag (any tag.) Nav to Edit. Hover over the post and choose Quick Edit. You can remove any tags you want, but you are not allowed to remove the last tag. Upon clicking update the last tag will always remain, regardless of what tag it is.

[sivel]

This exists in 3.0 also. Quick edit seems to require that the tags field not be empty.

[sivel]

Don't check if $tags_input is empty before running wp_set_post_tags, allow for removing all tags.

[sivel]

Moving milestone to 3.0, backport this the 2.9 branch if accepted.

[nacin]

I thought for sure I've seen this bug reported before, but I can't find a related ticket. If my memory serves me correctly, someone suggested that inserting a single space would force the tags to clear (which is true).

If anyone can find it, let's close one as a duplicate.

[nacin]

Bam: #11564.

Patch here looks better. Closing that as a duplicate.

[aaron_guitar]

Looks good to me.

[nacin]

Assigning to azaozz. I think this looks good, but he added the empty() check back in #6387 and I want to make sure we're all not missing something.

[nacin]

(In [14117]) Allow for removing all tags in quick edit. Check only if $tags_input isset (can be empty) before running wp_set_post_tags. props sivel, fixes #12318.