public FormStateInterface::setRebuild($rebuild = TRUE)
Sets the form to be rebuilt after processing.
bool $rebuild: (optional) Whether the form should be rebuilt or not. Defaults to TRUE.
$this
public function setRebuild($rebuild = TRUE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::setRebuild/8.1.x