When a `term_id` matches in `_get_term_children()`, recurse through its children until there is no more depth in the hierarchy. Since `get_terms()` return terms with a `count` of `0` when their children are not empty, we must return all children so that `get_terms()` can check their count.

In [27108], #26903 was fixed, but only because we were using the example in the ticket, leaving out infinite depth for hierarchical taxonomies.

Adds unit tests, including `Tests_Term_getTerms::test_get_terms_seven_levels_deep()`.

Fixes #26903. Again.


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git-svn-id: http://core.svn.wordpress.org/trunk@26992 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add some inline docs to `media-views.js` and remove some unnecessary comments from a few `super` calls.

Props gcorne.
See #26870.


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git-svn-id: http://core.svn.wordpress.org/trunk@26993 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce `maybe_regenerate_attachment_metadata( $attachment )`. On the Edit Media screen, call it for Audio and Video files.

The functions checks if the item is lacking metadata altogether. If a video or audio file was uploaded prior to 3.6, it does not have any metadata. This tries to fix it. Implements locking via a transient to protect against this running in parallel with another request.

This is the minimum viable product for #26825, but leaving the ticket open unless this function needs to be called in other places.

See #26825.


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git-svn-id: http://core.svn.wordpress.org/trunk@26994 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce `has_image_size( $name )`, a utility function that helps avoid loading the `$_wp_additional_image_sizes` global.

Props mordauk.
Fixes #26951.


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git-svn-id: http://core.svn.wordpress.org/trunk@26995 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add remove_image_size() and tests for it and has_image_size(), added in [27128].

props mordauk, markoheijnen.
fixes #26768. see #26951.

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git-svn-id: http://core.svn.wordpress.org/trunk@26996 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a filter `wp_insert_attachment_data` in `wp_insert_attachment()`. This is similar to the `wp_insert_post_data` filter in `wp_insert_post()`.

Fixes #20547.


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git-svn-id: http://core.svn.wordpress.org/trunk@26997 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Various JSHint fixes. see #26446.

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git-svn-id: http://core.svn.wordpress.org/trunk@26998 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve parameter documentation of add_meta_box().

props philiparthurmoore, DrewAPicture.
fixes #26698.

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git-svn-id: http://core.svn.wordpress.org/trunk@26999 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add meetup.com oEmbed support. see #23171.

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git-svn-id: http://core.svn.wordpress.org/trunk@27000 1a063a9b-81f0-0310-95a4-ce76da25c4cd