Fatal error when using Smarty 5 on newer civicrm versions

[codebymikey]

The following exception is thrown:

Fatal error: Uncaught Error: Cannot access protected property Smarty\Smarty::$template_dir in /app/application/vendor/civicrm/civicrm-packages/smarty5/Smarty.php:37
Stack trace:
#0 /app/application/web/sites/default/files/civicrm/ext/com.aghstrategies.memberid/memberid.civix.php(99): Smarty->__get('template_dir')
#1 /app/application/web/sites/default/files/civicrm/ext/com.aghstrategies.memberid/memberid.php(66): _memberid_civix_civicrm_config(Object(CRM_Core_Config))
#2 /app/application/vendor/civicrm/civicrm-core/CRM/Utils/Hook.php(276): memberid_civicrm_config(Object(CRM_Core_Config), Array)
#3 /app/application/vendor/civicrm/civicrm-core/CRM/Utils/Hook/DrupalBase.php(73): CRM_Utils_Hook->runHooks(Array, 'civicrm_config', 2, Object(CRM_Core_Config), Array, NULL, NULL, NULL, NULL)

[codebymikey]

Attached a static copy of the patch that works for me locally: civi-memberid-smarty-5-support.patch

Index: Support Smarty 5
Description: https://github.com/aghstrategies/com.aghstrategies.memberid/issues/3
===================================================================
diff --git a/memberid.civix.php b/memberid.civix.php
--- a/memberid.civix.php
+++ b/memberid.civix.php
@@ -95,13 +95,16 @@

   $extRoot = dirname(__FILE__) . DIRECTORY_SEPARATOR;
   $extDir = $extRoot . 'templates';

-  if (is_array($template->template_dir)) {
-    array_unshift($template->template_dir, $extDir);
+  $v2 = isset($template->_version) && version_compare($template->_version, 3, '<');
+  $templateDirs = (array) ($v2 ? $template->template_dir : $template->getTemplateDir());
+  array_unshift($templateDirs, $extDir);
+  if ($v2) {
+    $template->template_dir = $templateDirs;
   }
   else {
-    $template->template_dir = [$extDir, $template->template_dir];
+    $template->setTemplateDir($templateDirs);
   }

   $include_path = $extRoot . PATH_SEPARATOR . get_include_path();
   set_include_path($include_path);