remove filtering by unique value

Author: engcom-Charlie

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

@@ -101,12 +101,11 @@ private function prepareNamePrefixSuffixOptions($options, $isOptional = false)
         $result = [];
         $options = explode(';', $options);
         foreach ($options as $value) {
-            $value = $this->escaper->escapeHtml(trim($value)) ?: ' ';
-            $result[$value] = $value;
+            $result[] = $this->escaper->escapeHtml(trim($value)) ?: ' ';
         }
 
         if ($isOptional && trim(current($options))) {
-            $result = array_merge([' ' => ' '], $result);
+            $result = array_merge([' '], $result);
         }
 
         return $result;

dev/tests/integration/testsuite/Magento/Customer/Model/OptionsTest.php

@@ -102,9 +102,11 @@ public function optionsDataProvider(): array
         $optionPrefixName = 'prefix';
         $optionSuffixName = 'suffix';
         $optionValues = 'v1;v2';
+        $expectedValues = ['v1', 'v2'];
         $optionValuesWithBlank = ';v1;v2';
-        $expectedValuesWithBlank = [' ' => ' ', 'v1' => 'v1', 'v2' => 'v2'];
-        $expectedValues = ['v1' => 'v1', 'v2' => 'v2'];
+        $expectedValuesWithBlank = [' ', 'v1', 'v2'];
+        $optionValuesWithTwoBlank = ';v1;v2;';
+        $expectedValuesTwoBlank = [' ', 'v1', 'v2', ' '];
 
         return [
             'prefix_required_with_blank_option' => [
@@ -119,6 +121,12 @@ public function optionsDataProvider(): array
                 [self::XML_PATH_PREFIX_OPTIONS => $optionValues],
                 $expectedValues,
             ],
+            'prefix_required_with_two_blank_option' => [
+                $optionPrefixName,
+                [self::XML_PATH_PREFIX_SHOW => Nooptreq::VALUE_REQUIRED],
+                [self::XML_PATH_PREFIX_OPTIONS => $optionValuesWithTwoBlank],
+                $expectedValuesTwoBlank,
+            ],
             'prefix_optional' => [
                 $optionPrefixName,
                 [self::XML_PATH_PREFIX_SHOW => Nooptreq::VALUE_OPTIONAL],