MC-23554: Customer custom multiline attribute displays incorrectly

Author: SmVladyslav

app/code/Magento/Customer/Model/Customer/DataProviderWithDefaultAddresses.php

@@ -17,6 +17,7 @@
 use Magento\Framework\Session\SessionManagerInterface;
 use Magento\Customer\Model\FileUploaderDataResolver;
 use Magento\Customer\Model\AttributeMetadataResolver;
+use Magento\Ui\Component\Form\Element\Multiline;
 use Magento\Ui\DataProvider\AbstractDataProvider;
 
 /**
@@ -130,6 +131,7 @@ public function getData(): array
                 $result['customer'],
                 array_flip(self::$forbiddenCustomerFields)
             );
+            $this->prepareCustomAttributeValue($result['customer']);
             unset($result['address']);
 
             $result['default_billing_address'] = $this->prepareDefaultAddress(
@@ -179,6 +181,24 @@ private function prepareDefaultAddress($address): array
         return $addressData;
     }
 
+    /***
+     * Prepare values for Custom Attributes.
+     *
+     * @param array $data
+     * @return void
+     */
+    private function prepareCustomAttributeValue(array &$data): void
+    {
+        foreach ($this->meta['customer']['children'] as $attributeName => $attributeMeta) {
+            if ($attributeMeta['arguments']['data']['config']['dataType'] === Multiline::NAME
+                && isset($data[$attributeName])
+                && !is_array($data[$attributeName])
+            ) {
+                $data[$attributeName] = explode("\n", $data[$attributeName]);
+            }
+        }
+    }
+
     /**
      * Get attributes meta
      *

app/code/Magento/Customer/Model/Metadata/Form/Multiline.php

@@ -78,7 +78,7 @@ public function validateValue($value)
     public function compactValue($value)
     {
         if (is_array($value)) {
-            $value = implode("\n", $value);
+            $value = trim(implode("\n", $value));
         }
         $value = [$value];
 

app/code/Magento/Ui/Component/Form/Element/Multiline.php

@@ -66,7 +66,6 @@ public function prepare()
     {
         $size = abs((int) $this->getData('config/size'));
         $validation = [$this->getData('config/validation')];
-        $namespace = $this->getContext()->getNamespace();
         while ($size--) {
             $identifier = $this->getName() . '_' . $size;
             $arguments = [
@@ -75,8 +74,6 @@ public function prepare()
                     'config' => [
                         'dataScope' => $size,
                         'dataType' => static::DATA_TYPE,
-                        'deps' => "{$namespace}.areas.customer.customer.{$this->getName()}",
-                        'provider' => $namespace . '.' . $this->getContext()->getDataProvider()->getName(),
                         'formElement' => static::FORM_ELEMENT,
                         'sortOrder' => $size,
                     ]

dev/tests/js/jasmine/tests/app/code/Magento/Ui/base/js/form/components/multiline.test.js

@@ -17,8 +17,10 @@ define([
                 registry.set(providerName, {
                     /** Stub */
                     on: function () {},
+
                     /** Stub */
                     set: function () {},
+
                     /** Stub */
                     get: function () {
                         return value;
@@ -48,15 +50,15 @@ define([
             });
 
             it('Check preparation of string value with line breaks', function () {
-                var value = '\n222\n';
+                var value = 'first\n\nthird';
 
                 prepareDataProvider(value);
                 obj = new Constr({
                     provider: providerName,
                     dataScope: dataScope
                 });
 
-                expect(obj.value()).toEqual(['', '222', '']);
+                expect(obj.value()).toEqual(['first', '', 'third']);
             });
         });
     });