get_media_items

		if ( false === $terms ) {
			$terms = wp_get_object_terms( $post->ID, $taxonomy, $t['args'] );
		}

		$values = array();

		foreach ( $terms as $term ) {
			$values[] = $term->slug;
		}

		$t['value'] = join( ', ', $values );

		$form_fields[ $taxonomy ] = $t;
	}

	/*
	 * Merge default fields with their errors, so any key passed with the error
	 * (e.g. 'error', 'helps', 'value') will replace the default.
	 * The recursive merge is easily traversed with array casting:
	 * foreach ( (array) $things as $thing )
	 */
	$form_fields = array_merge_recursive( $form_fields, (array) $errors );

	// This was formerly in image_attachment_fields_to_edit().
	if ( 'image' === substr( $post->post_mime_type, 0, 5 ) ) {
		$alt = get_post_meta( $post->ID, '_wp_attachment_image_alt', true );

		if ( empty( $alt ) ) {
			$alt = '';
		}

		$form_fields['post_title']['required'] = true;

		$form_fields['image_alt'] = array(
			'value' => $alt,