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I tried to use 'group_by' option with a call to a static method.
$form = $this->createFormBuilder()
->add('files', 'choice', [
'choices' => [/* Some Choices */],
'choices_as_values' => true,
'group_by' => 'MyStatic::method'
])
->getForm();
Here is a dummy code sample of what I'm doing.
I saw in Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator::createView line 203, the test is if (is_string($groupBy)).
I think it should be if (is_string($groupBy) && !is_callable($groupBy)).
I have test with option choice_value, and other new options, but this bug may exists for those ones too.
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