Ticket #27979: 27979.patch

src/wp-includes/class-wp-customize-setting.php

@@ -131 +131 @@
                                  *
                                  * @since 3.4.0
                                  */
-                                do_action( 'customize_preview_' . $this->id );
+                                do_action( 'customize_preview_' . $this->id, $this );
                 }
         }
 
@@ -248 +248 @@
                                  *
                                  * @param mixed $value Value of the setting.
                                  */
-                                return do_action( 'customize_update_' . $this->type, $value );
+                                return do_action( 'customize_update_' . $this->type, $value, $this );
                 }
         }