make copying files compliant to 4.5

controllers/copy.php

@@ -272,11 +272,19 @@ class CopyController extends PluginController
                             $oldtopfolder = Folder::findTopFolder($oldcourse->getId());
                             $newtopfolder = Folder::findTopFolder($newcourse->getId());
                             foreach ($oldtopfolder->file_refs as $fileref) {
+                                if (StudipVersion::newerThan("4.6")) {
                                     FileManager::copyFile(
                                         $fileref->getFileType(),
                                         $newtopfolder->getTypedFolder(),
                                         User::findCurrent()
                                     );
+                                } else {
+                                    FileManager::copyFileRef(
+                                        $fileref,
+                                        $newtopfolder->getTypedFolder(),
+                                        User::findCurrent()
+                                    );
+                                }
                             }
                             foreach ($oldtopfolder->subfolders as $subfolder) {
                                 FileManager::copyFolder(

plugin.manifest

 pluginname=CourseCopy
 pluginclassname=CourseCopy
-version=1.8.2
+version=1.8.3
 origin=data-quest
-studipMinVersion=4.6
+studipMinVersion=4.0
 studipMaxVersion=5.0.99