Ticket #30497: 30497.diff

src/wp-admin/includes/class-wp-upgrader.php

@@ -1239 +1239 @@
                         return;
                 }
 
-                $skin = new Language_Pack_Upgrader_Skin( array(
+                /**
+                 * Filter the upgrader skin class used by Language_Pack_Upgrader when called via Language_Pack_Upgrader::async_upgrade().
+                 *
+                 * @since 4.2.0
+                 *
+                 * @param string $skin_class Skin class name (default: Language_Pack_Upgrader_Skin)
+                 */
+                $skin_class = apply_filters( 'async_update_translation_skin_class', 'Language_Pack_Upgrader_Skin' );
+
+                $skin = new $skin_class( array(
                         'skip_header_footer' => true,
                 ) );