ACP2E-456: Mexican currency symbol (MX$) is not displayed for es_MX locale

Author: Anna Bukatar

app/code/Magento/CurrencySymbol/Model/System/Currencysymbol.php

@@ -27,14 +27,14 @@ class Currencysymbol
     protected $_symbolsData = [];
 
     /**
-     * Store id
+     * Current store id
      *
      * @var string|null
      */
     protected $_storeId;
 
     /**
-     * Website id
+     * Current website id
      *
      * @var string|null
      */
@@ -55,19 +55,19 @@ class Currencysymbol
     /**
      * Config path to custom currency symbol value
      */
-    const XML_PATH_CUSTOM_CURRENCY_SYMBOL = 'currency/options/customsymbol';
+    public const XML_PATH_CUSTOM_CURRENCY_SYMBOL = 'currency/options/customsymbol';
 
-    const XML_PATH_ALLOWED_CURRENCIES = \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_ALLOW;
+    public const XML_PATH_ALLOWED_CURRENCIES = \Magento\Directory\Model\Currency::XML_PATH_CURRENCY_ALLOW;
 
     /*
      * Separator used in config in allowed currencies list
      */
-    const ALLOWED_CURRENCIES_CONFIG_SEPARATOR = ',';
+    public const ALLOWED_CURRENCIES_CONFIG_SEPARATOR = ',';
 
     /**
      * Config currency section
      */
-    const CONFIG_SECTION = 'currency';
+    public const CONFIG_SECTION = 'currency';
 
     /**
      * Core event manager proxy
@@ -193,7 +193,7 @@ public function getCurrencySymbolsData()
     public function setCurrencySymbolsData($symbols = [])
     {
         if (!$this->_storeManager->isSingleStoreMode()) {
-            foreach ($this->getCurrencySymbolsData() as $code => $values) {
+            foreach (array_keys($this->getCurrencySymbolsData()) as $code) {
                 if (isset($symbols[$code]) && empty($symbols[$code])) {
                     unset($symbols[$code]);
                 }