Ticket #30240: 30240.3.patch

src/wp-admin/includes/class-wp-ms-themes-list-table.php

@@ -573 +573 @@
                                 __( 'Visit Theme Site' )
                         );
                 }
+
+                if ( $theme->parent() ) {
+                        if ( $theme->parent()->get ( 'ThemeURI' ) ) {
+                                /* translators: %2$s: theme name */
+                                $child_theme_meta = sprintf ( 'Child theme of <a href="%1$s" aria-label="%2$s">%2$s</a>', esc_url ( $theme->parent ()->get ( 'ThemeURI' ) ), esc_attr ( $theme->parent ()->get ( 'Name' ) ) );
+                        } else {
+                                /* translators: %s: theme name */
+                                $child_theme_meta = sprintf ( 'Child theme of %s.', esc_attr ( $theme->parent ()->get ( 'Name' ) ) );
+                        }
+                        /* translators: %s: theme name */
+                        $theme_meta[] = sprintf ( __ ( '%s' ), $child_theme_meta );
+                }
+
                 /**
                  * Filters the array of row meta for each theme in the Multisite themes
                  * list table.