From fd538897d0abfe840ca9c17bffc23a7cc91aa420 Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Fri, 18 Mar 2022 08:57:19 -0400
Subject: [PATCH] Fix issue processwire/processwire-issues#1542

---
 wire/core/Fieldgroups.php |  3 ++-
 wire/core/Templates.php   | 13 ++++++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/wire/core/Fieldgroups.php b/wire/core/Fieldgroups.php
index de5ce983..f37872d6 100644
--- a/wire/core/Fieldgroups.php
+++ b/wire/core/Fieldgroups.php
@@ -9,7 +9,8 @@
  * 
  * ProcessWire 3.x, Copyright 2022 by Ryan Cramer
  * https://processwire.com
- * 
+ *
+ * @method Fieldgroup clone(Saveable $item, $name = '')
  * @method int saveContext(Fieldgroup $fieldgroup)
  * @method array getExportData(Fieldgroup $fieldgroup)
  * @method array setImportData(Fieldgroup $fieldgroup, array $data)
diff --git a/wire/core/Templates.php b/wire/core/Templates.php
index 2b4dfc4b..2647e746 100644
--- a/wire/core/Templates.php
+++ b/wire/core/Templates.php
@@ -380,7 +380,7 @@ class Templates extends WireSaveableItems {
 
 		if($fieldgroup->name == $item->name) {
 			// if the fieldgroup and the item have the same name, we'll also clone the fieldgroup
-			$fieldgroup = $this->wire('fieldgroups')->clone($fieldgroup, $name); 	
+			$fieldgroup = $this->wire()->fieldgroups->clone($fieldgroup, $name); 	
 			$item->fieldgroup = $fieldgroup;
 		}
 
@@ -388,10 +388,13 @@ class Templates extends WireSaveableItems {
 
 		if($item && $item->id && !$item->altFilename) { 
 			// now that we have a clone, lets also clone the template file, if it exists
-			$path = $this->wire('config')->paths->templates; 
-			$file = $path . $item->name . '.' . $this->wire('config')->templateExtension; 
-			if($original->filenameExists() && is_writable($path) && !file_exists($file)) { 
-				if(copy($original->filename, $file)) $item->filename = $file;
+			$config = $this->wire()->config;
+			$files = $this->wire()->files;
+			$path = $config->paths->templates; 
+			$ext = $config->templateExtension ? $config->templateExtension : 'php';
+			$file = "$path$item->name.$ext";
+			if($original->filenameExists() && is_writable($path) && !$files->exists($file)) { 
+				if($files->copy($original->filename, $file)) $item->filename = $file;
 			}
 		}