Merge branch '5.4' into 6.0

* 5.4:
  Fix CS in README files
  Fix markdown
  [HttpKernel] Fixes tests for PHP7.4+
  fix test
  [HttpKernel] Throw when HttpKernel is created and the env is empty
  [FrameworkBundle] Deprecate the `AdapterInterface` autowiring alias, use `CacheItemPoolInterface` instead
  [Filesystem] fix readlink for Windows

Author: nicolas-grekas

Filesystem.php

@@ -423,14 +423,6 @@ public function readlink(string $path, bool $canonicalize = false)
                 return null;
             }
 
-            if ('\\' === \DIRECTORY_SEPARATOR) {
-                $path = readlink($path);
-            }
-
-            return realpath($path);
-        }
-
-        if ('\\' === \DIRECTORY_SEPARATOR) {
             return realpath($path);
         }
 

README.md

@@ -6,8 +6,8 @@ The Filesystem component provides basic utilities for the filesystem.
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/filesystem.html)
-  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
-  * [Report issues](https://github.com/symfony/symfony/issues) and
-    [send Pull Requests](https://github.com/symfony/symfony/pulls)
-    in the [main Symfony repository](https://github.com/symfony/symfony)
+ * [Documentation](https://symfony.com/doc/current/components/filesystem.html)
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/symfony/issues) and
+   [send Pull Requests](https://github.com/symfony/symfony/pulls)
+   in the [main Symfony repository](https://github.com/symfony/symfony)

Tests/FilesystemTest.php

@@ -376,7 +376,7 @@ public function testRemoveCleansInvalidLinks()
 
         // create symlink to nonexistent dir
         rmdir($basePath.'dir');
-        $this->assertFalse('\\' === \DIRECTORY_SEPARATOR ? @readlink($basePath.'dir-link') : is_dir($basePath.'dir-link'));
+        $this->assertFalse(is_dir($basePath.'dir-link'));
 
         $this->filesystem->remove($basePath);
 
@@ -1076,6 +1076,7 @@ public function testReadAbsoluteLink()
         $this->filesystem->symlink($link1, $link2);
 
         $this->assertEquals($file, $this->filesystem->readlink($link1));
+
         $this->assertEquals($link1, $this->filesystem->readlink($link2));
         $this->assertEquals($file, $this->filesystem->readlink($link1, true));
         $this->assertEquals($file, $this->filesystem->readlink($link2, true));