Resolve connection root for path prefixing

FtpAdapter.php

@@ -96,7 +96,8 @@ public function __construct(
         $this->connectionProvider = $connectionProvider ?: new FtpConnectionProvider();
         $this->connectivityChecker = $connectivityChecker ?: new NoopCommandConnectivityChecker();
         $this->visibilityConverter = $visibilityConverter ?: new PortableVisibilityConverter();
-        $this->prefixer = new PathPrefixer($connectionOptions->root());
+        $this->rootDirectory = $this->resolveConnectionRoot($this->connection());
+        $this->prefixer = new PathPrefixer($this->rootDirectory);
         $this->mimeTypeDetector = $mimeTypeDetector ?: new FinfoMimeTypeDetector();
     }
 
@@ -119,7 +120,6 @@ private function connection()
         start:
         if ( ! $this->hasFtpConnection()) {
             $this->connection = $this->connectionProvider->createConnection($this->connectionOptions);
-            $this->rootDirectory = $this->resolveConnectionRoot($this->connection);
 
             return $this->connection;
         }
@@ -596,7 +596,7 @@ private function ensureDirectoryExists(string $dirname, ?string $visibility): vo
         $connection = $this->connection();
 
         $dirPath = '';
-        $parts = explode('/', rtrim($dirname, '/'));
+        $parts = explode('/', trim($dirname, '/'));
         $mode = $visibility ? $this->visibilityConverter->forDirectory($visibility) : false;
 
         foreach ($parts as $part) {

FtpAdapterTestCase.php

@@ -58,13 +58,11 @@ public function using_empty_string_for_root(): void
         $this->runScenario(function () use ($options) {
             $adapter = new FtpAdapter($options);
 
-            $adapter->write('dirname/path.txt', 'contents', new Config([
-                Config::OPTION_VISIBILITY => Visibility::PUBLIC,
-                Config::OPTION_DIRECTORY_VISIBILITY => Visibility::PUBLIC
-            ]));
+            $adapter->write('dirname1/dirname2/path.txt', 'contents', new Config());
+            $adapter->write('dirname1/dirname2/path.txt', 'contents', new Config());
 
-            $this->assertTrue($adapter->fileExists('dirname/path.txt'));
-            $this->assertSame('contents', $adapter->read('dirname/path.txt'));
+            $this->assertTrue($adapter->fileExists('dirname1/dirname2/path.txt'));
+            $this->assertSame('contents', $adapter->read('dirname1/dirname2/path.txt'));
         });
     }