Ignore hidden addon folders

src/Core/Addon/AddonManagerHelper.php

@@ -82,7 +82,9 @@ final class AddonManagerHelper implements AddonHelper
 		$files = [];
 
 		foreach ($dirs as $dirname) {
-			if (in_array($dirname, ['.', '..'])) {
+			// ignore hidden files and folders
+			// @TODO: Replace with str_starts_with() when PHP 8.0 is the minimum version
+			if (\strncmp($dirname, '.', 1) === 0) {
 				continue;
 			}
 

tests/Unit/Core/Addon/AddonManagerHelperTest.php

@@ -141,6 +141,9 @@ class AddonManagerHelperTest extends TestCase
 		$root = vfsStream::setup(__FUNCTION__ . '_addons', 0777, [
 			'helloaddon' => [
 				'helloaddon.php' => '<?php',
+			],
+			'.hidden' => [
+				'.hidden.php' => 'This folder should be ignored',
 			]
 		]);