Ticket #21881: 21881.2.patch

src/wp-includes/category-template.php

@@ -511 +511 @@
                 }
         } else {
                 if ( ! empty( $show_option_all ) ) {
-                        $posts_page = ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) ? get_permalink( get_option( 'page_for_posts' ) ) : home_url( '/' );
+                        // We're explicitly specifying a post type
+                        $post_type = get_query_var( 'post_type' );
+                        if ( $post_type && is_string( $post_type ) ) {
+                                $posts_page = get_post_type_archive_link( $post_type );
+                        } elseif ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) {
+                                $posts_page = get_permalink( get_option( 'page_for_posts' ) );
+                        } else {
+                                $posts_page = home_url( '/' );
+                        }
                         $posts_page = esc_url( $posts_page );
                         if ( 'list' == $r['style'] ) {
                                 $output .= "<li class='cat-item-all'><a href='$posts_page'>$show_option_all</a></li>";