Ticket #49241: 49241.diff

wp-includes/class-wp-theme.php

@@ -1203 +1203 @@
                                         $types = explode( ',', _cleanup_header_comment( $type[1] ) );
                                 }
 
+                                $extend_types = array();
+                                foreach ( $types as $type ) {
+
+                                        /**
+                                         * Filter and extend post types supported by current template.
+                                         *
+                                         * @since x.x.x
+                                         *
+                                         * @param string   $type         Post type to extend.
+                                         * @param string[] $extend_types Array of post types that extend $type parameter
+                                         */
+                                        $extend_types = apply_filters( 'template_post_types', $type, $extend_types );
+                                }
+                                $types = array_unique( array_merge( $extend_types, $types ) );
+
                                 foreach ( $types as $type ) {
                                         $type = sanitize_key( $type );
                                         if ( ! isset( $post_templates[ $type ] ) ) {