Obscure.php

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<?php
namespace Magento\Framework\Data\Form\Element;

class Obscure extends \Magento\Framework\Data\Form\Element\Password
{
    protected $_obscuredValue = '******';

    public function getEscapedValue($index = null)
    {
        $value = parent::getEscapedValue($index);
        if (!empty($value)) {
            return $this->_obscuredValue;
        }
        return $value;
    }

    public function getHtmlAttributes()
    {
        return [
            'type',
            'title',
            'class',
            'style',
            'onclick',
            'onchange',
            'onkeyup',
            'disabled',
            'readonly',
            'maxlength',
            'tabindex',
            'data-form-part',
            'data-role',
            'data-action'
        ];
    }
}