[-] MO: regenerate the class_index after adding a new override

classes/module/Module.php

@@ -1917,6 +1917,8 @@ abstract class ModuleCore
 			if (!is_writable(dirname($override_dest)))
 				throw new Exception(sprintf(Tools::displayError('directory (%s) not writable'), dirname($override_dest)));
 			copy($override_src, $override_dest);
+			// Re-generate the class index
+			Autoload::getInstance()->generateIndex();
 			return true;
 		}