Issue #2341461 by ashutoshsngh, esod, quietone: Remove usage of form_options_flatten()
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@ -12,6 +12,7 @@ use Drupal\Component\Utility\Unicode;
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use Drupal\Core\Form\FormStateInterface;
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use Drupal\views\Plugin\views\display\DisplayPluginBase;
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use Drupal\views\ViewExecutable;
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use Drupal\Core\Form\OptGroup;
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/**
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* Simple filter to handle matching of multiple options selectable via checkboxes
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@ -435,7 +436,7 @@ class InOperator extends FilterPluginBase {
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}
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// Some filter_in_operator usage uses optgroups forms, so flatten it.
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$flat_options = form_options_flatten($this->valueOptions, TRUE);
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$flat_options = OptGroup::flattenOptions($this->valueOptions);
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// Remove every element which is not known.
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foreach ($this->value as $value) {
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