Ticket #19288: 19288.2.patch

src/wp-admin/menu-header.php

@@ -76 +76 @@
                 $aria_attributes = '';
                 $aria_hidden = '';
                 $is_separator = false;
+                $screen = get_current_screen();
 
                 if ( $first ) {
                         $class[] = 'wp-first-item';
@@ -88 +89 @@
                         $submenu_items = $submenu[$item[2]];
                 }
 
-                if ( ( $parent_file && $item[2] == $parent_file ) || ( empty($typenow) && $self == $item[2] ) ) {
+                if ( ( $parent_file && $item[2] == $parent_file ) || ( empty($typenow) && $self == $item[2] ) || ( 'edit-tags' == $screen->base && false !== strpos($item[2], 'post_type=' . $screen->post_type) ) ) {
                         $class[] = ! empty( $submenu_items ) ? 'wp-has-current-submenu wp-menu-open' : 'current';
                 } else {
                         $class[] = 'wp-not-current-submenu';