The complete form structure.
#process, #after_build, #element_validate, and other handlers being invoked on a form element may use this reference to access other information in the form the element is contained in.
This property is uncacheable.
Type: array
self::getCompleteForm()
protected $complete_form;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::complete_form/8.1.x