ENGCOM-4631: #21779 Adminhtml textarea field doesn't accept maxlength #21816

Author: sivaschenko

lib/internal/Magento/Framework/Data/Form/Element/Textarea.php

@@ -4,15 +4,15 @@
  * See COPYING.txt for license details.
  */
 
-/**
- * Form textarea element
- *
- * @author      Magento Core Team <core@magentocommerce.com>
- */
 namespace Magento\Framework\Data\Form\Element;
 
 use Magento\Framework\Escaper;
 
+/**
+ * Form textarea element.
+ *
+ * @author      Magento Core Team <core@magentocommerce.com>
+ */
 class Textarea extends AbstractElement
 {
     /**
@@ -64,6 +64,7 @@ public function getHtmlAttributes()
             'rows',
             'cols',
             'readonly',
+            'maxlength',
             'disabled',
             'onkeyup',
             'tabindex',

lib/internal/Magento/Framework/Data/Test/Unit/Form/Element/TextareaTest.php

@@ -4,11 +4,11 @@
  * See COPYING.txt for license details.
  */
 
-/**
- * Tests for \Magento\Framework\Data\Form\Element\Textarea
- */
 namespace Magento\Framework\Data\Test\Unit\Form\Element;
 
+/**
+ * Tests for \Magento\Framework\Data\Form\Element\Textarea class.
+ */
 class TextareaTest extends \PHPUnit\Framework\TestCase
 {
     /**
@@ -76,6 +76,7 @@ public function testGetHtmlAttributes()
                     'rows',
                     'cols',
                     'readonly',
+                    'maxlength',
                     'disabled',
                     'onkeyup',
                     'tabindex',