[WIP] Remove mysql4 classes

.gitignore

@@ -71,3 +71,7 @@
 
 phpstan*.neon
 !phpstan.dist.*.neon
+
+# ignore files from bc-mysql4
+app/code/community/Mage/*/Model/Mysql4
+!app/code/core/Mage/Dataflow/Model/Mysql4/Catalogold.php

app/Mage.php

@@ -683,7 +683,7 @@ public static function init($code = '', $type = 'store', $options = [], $modules
     {
         try {
             self::setRoot();
-            self::$_app     = new Mage_Core_Model_App();
+            self::$_app = new Mage_Core_Model_App();
             self::_setIsInstalled($options);
             self::_setConfigModel($options);
 
@@ -719,7 +719,7 @@ public static function run($code = '', $type = 'store', $options = [])
             if (isset($options['edition'])) {
                 self::$_currentEdition = $options['edition'];
             }
-            self::$_app    = new Mage_Core_Model_App();
+            self::$_app = new Mage_Core_Model_App();
             if (isset($options['request'])) {
                 self::$_app->setRequest($options['request']);
             }
@@ -861,7 +861,7 @@ public static function log($message, $level = null, $file = '', $forceLog = fals
             $maxLogLevel = Zend_Log::DEBUG;
         }
 
-        $level  = is_null($level) ? Zend_Log::DEBUG : $level;
+        $level = is_null($level) ? Zend_Log::DEBUG : $level;
 
         if (!self::$_isDeveloperMode && $level > $maxLogLevel) {
             return;