Holy incremental improvements Batman! This second feature release of 2019 changes the way private posts and non-hierarchical taxonomies are handled. As part of these changes, a new filter was added bcn_show_post_private. Additionally, the %link% template tag is now allowed in the “unlinked” breadcrumb templates. Lastly, how the Media post type settings are handles changed. Previously, it was referred to as “Attachments” within the Breadcrumb NavXT settings page. Now, this post type is referred to by its actual name (Media) and additional settings are available for it in the settings page.
bcn_show_post_private Filter
Beginning in 6.4.0, the default behavior for private posts has changed. If a parent of a post has the published status of private, it no longer will be included in the breadcrumb trail (Breadcrumb NavXT will skip over it). While this was deemed the most appropriate behavior, some users may want the old behavior. To facilitate that, the bcn_show_post_private filter was added in 6.4.0.
bcn_show_type_term_archive Filter
Since 3.9.0, Breadcrumb NavXT has attempted to associate a taxonomy with a post type to include the type archive in the breadcrumb trail. This was not controllable (if the post type had an archive and it was enabled in the settings for that post type, it would show up in the breadcrumb trails for associated taxonomy terms). To allow users to control this behavior, the bcn_show_type_term_archive filter was added in 6.4.0.
Non-Hierarchical Taxonomies
Previously, the use of non-hierarchical taxonomies as the parent for posts was handled in a very different manner than hierarchical taxonomies. This is quite hacky, and incompatible with the newer bcn_display_json_ld() function. To resolve some of these incompatibilities, when a post has onl only a single non-hierarchical term, the hierarchical term codepath will be used. This will result in the same breadcrumb trial being produced, however, it will no longer cause issues with bcn_display_json_ld.
-John Havlik
