Ticket #27538: 27538.2.patch

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

@@ -1083 +1083 @@
                 // Invoke the widget update callback.
                 foreach ( (array) $wp_registered_widget_updates as $name => $control ) {
                         if ( $name === $parsed_id['id_base'] && is_callable( $control['callback'] ) ) {
+                                $_suspend_cache = wp_suspend_cache_addition();
+                                wp_suspend_cache_addition( true );
                                 ob_start();
                                 call_user_func_array( $control['callback'], $control['params'] );
                                 ob_end_clean();
+                                wp_suspend_cache_addition( $_suspend_cache );
                                 break;
                         }
                 }

src/wp-includes/option.php

@@ -626 +626 @@
  * @return bool False if value was not set and true if value was set.
  */
 function set_transient( $transient, $value, $expiration = 0 ) {
+        if ( wp_suspend_cache_addition() )
+                return false;
 
         /**
          * Filter a specific transient before its value is set.
@@ -1366 +1368 @@
  * @return bool False if value was not set and true if value was set.
  */
 function set_site_transient( $transient, $value, $expiration = 0 ) {
+        if ( wp_suspend_cache_addition() )
+                return false;
 
         /**
          * Filter the value of a specific site transient before it is set.