Ticket #37010: 37010.diff

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

@@ -539 +539 @@
          */
         public function validate( $value ) {
                 if ( is_wp_error( $value ) ) {
-                        return $value;
+                        $validity = clone $value;
+                } else {
+                        $validity = new WP_Error();
                 }
+
                 if ( is_null( $value ) ) {
-                        return new WP_Error( 'invalid_value', __( 'Invalid value.' ) );
+                        $validity->add( 'invalid_value', __( 'Invalid value.' ) );
                 }
 
-                $validity = new WP_Error();
-
                 /**
-                 * Validate a Customize setting value.
+                 * Filters the validity of a Customize setting value.
                  *
                  * Plugins should amend the `$validity` object via its `WP_Error::add()` method.
                  *
                  * @since 4.6.0
                  *
-                 * @param WP_Error             $validity Filtered from `true` to `WP_Error` when invalid.
+                 * @param WP_Error             $validity Object with errors added, if any.
                  * @param mixed                $value    Value of the setting.
                  * @param WP_Customize_Setting $this     WP_Customize_Setting instance.
                  */