Ticket #28232: 28232.diff

src/wp-admin/includes/class-wp-posts-list-table.php

@@ -218 +218 @@
                                 wp_dropdown_categories( $dropdown_options );
                         }
 
+                        $others = wp_list_filter( get_taxonomies( array( 'show_admin_filter' => true ), 'objects' ), array( 'name' => 'category' ), 'NOT' );
+                        foreach ( $others as $other ) {
+                                if ( is_object_in_taxonomy( $this->screen->post_type, $other->name ) ) {
+                                        $dropdown_options = array(
+                                                'taxonomy' => $other->name,
+                                                'show_option_all' => __( 'View all ' ) . $other->labels->name,
+                                                'hide_empty' => 0,
+                                                'hierarchical' => $other->hierarchical,
+                                                'show_count' => 0,
+                                                'orderby' => 'name',
+                                                'name' => $other->query_var,
+                                                'selected' => get_query_var( $other->query_var )
+                                        );
+                                        wp_dropdown_categories( $dropdown_options );
+                                }
+                        }
+
                         /**
                          * Fires before the Filter button on the Posts and Pages list tables.
                          *

src/wp-includes/taxonomy.php

@@ -337 +337 @@
                 'show_in_nav_menus'     => null,
                 'show_tagcloud'         => null,
                 'show_admin_column'     => false,
+                'show_admin_filter'     => false,
                 'meta_box_cb'           => null,
                 'capabilities'          => array(),
                 'rewrite'               => true,