Class \Magento\Framework\Data\Form\Element\Textarea breaks specification of the parent class \Magento\Framework\Data\Form\Element\AbstractElement by not calling the method getAfterElementJs()

https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/Data/Form/Element/AbstractElement.php#L406-L414


https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/Data/Form/Element/AbstractElement.php#L371-L373


https://github.com/magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/Data/Form/Element/Textarea.php#L76-L90


https://github.com/magento/magento2/issues/2615

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