3 files declare their use of OptGroup
- EntityReferenceItem.php in core/
lib/ Drupal/ Core/ Field/ Plugin/ Field/ FieldType/ EntityReferenceItem.php - OptGroupTest.php in core/
tests/ Drupal/ Tests/ Core/ Form/ OptGroupTest.php - OptionsWidgetBase.php in core/
lib/ Drupal/ Core/ Field/ Plugin/ Field/ FieldWidget/ OptionsWidgetBase.php
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