Merge pull request #14415 from nextcloud/backport/13844/stable14

[stable14] Bugfix for issue 10862: Trash-bin ignores trashbin_retention_obligation

Author: rullzer

apps/files_trashbin/lib/Trashbin.php

@@ -680,11 +680,10 @@ private static function calculateFreeSpace($trashbinSize, $user) {
 		// calculate available space for trash bin
 		// subtract size of files and current trash bin size from quota
 		if ($softQuota) {
-			$userFolder = \OC::$server->getUserFolder($user);
-			if(is_null($userFolder)) {
-				return 0;
-			}
-			$free = $quota - $userFolder->getSize(); // remaining free space for user
+			$files_view = new View('/' . $user . '/files');
+			$rootInfo = $files_view->getFileInfo('/', false);
+			$free = $quota - $rootInfo['size']; // remaining free space for user
+
 			if ($free > 0) {
 				$availableSpace = ($free * self::DEFAULTMAXSIZE / 100) - $trashbinSize; // how much space can be used for versions
 			} else {