wp-includes/customize/class-wp-widget-form-customize-control.php:137Whether the current widget is rendered on the page.
bool public function active_callback() { return $this->manager->widgets->is_widget_rendered( $this->widget_id ); }Introduced in 4.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/customize/class-wp-widget-form-customize-control.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.