public ImageToolkitBase::validateConfigurationForm(array &$form, FormStateInterface $form_state)
Form validation handler.
array $form: An associative array containing the structure of the plugin form as built by static::buildConfigurationForm().
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the complete form.
Overrides PluginFormInterface::validateConfigurationForm
public function validateConfigurationForm(array &$form, FormStateInterface $form_state) { }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!ImageToolkit!ImageToolkitBase.php/function/ImageToolkitBase::validateConfigurationForm/8.1.x