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Add minItems to Stack field

Adriano Faria

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I'm able to make a validation:

$form->add( new \IPS\Helpers\Form\Stack( 'question_wrong', isset( $question['question_wrong']) ? json_decode( $question['question_wrong'], TRUE ) : array(), TRUE, array( 'maxItems' => $container->max_answers-1 ), function( $val ) use( $container ) {
				if( $val and is_array( $val ) AND count( $val ) < $container->min_answers-1 )
					throw new \InvalidArgumentException( 'quizz_min_number_questions_required' );
			}, NULL, NULL, 'question_wrong' ) );

But I'm also able to make it for max items, so for consistency sake,  minItems would save us time.

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