fixed wrong implementation

Author: infeo

src/main/java/org/cryptomator/cryptofs/CryptoFileSystemImpl.java

@@ -18,7 +18,7 @@
 import org.cryptomator.cryptofs.common.DeletingFileVisitor;
 import org.cryptomator.cryptofs.common.FinallyUtil;
 import org.cryptomator.cryptofs.dir.CiphertextDirectoryDeleter;
-import org.cryptomator.cryptofs.dir.DirIdBackupFilter;
+import org.cryptomator.cryptofs.dir.ExcludeDirIdBackupFilter;
 import org.cryptomator.cryptofs.dir.DirectoryStreamFactory;
 import org.cryptomator.cryptofs.fh.OpenCryptoFiles;
 import org.cryptomator.cryptolib.api.Cryptor;
@@ -624,7 +624,7 @@ private void moveDirectory(CryptoPath cleartextSource, CryptoPath cleartextTarge
 			// check if dir is empty:
 			Path targetCiphertextDirContentDir = cryptoPathMapper.getCiphertextDir(cleartextTarget).path;
 			boolean targetCiphertextDirExists = true;
-			try (DirectoryStream<Path> ds = Files.newDirectoryStream(targetCiphertextDirContentDir, new DirIdBackupFilter())) {
+			try (DirectoryStream<Path> ds = Files.newDirectoryStream(targetCiphertextDirContentDir, new ExcludeDirIdBackupFilter())) {
 				if (ds.iterator().hasNext()) {
 					throw new DirectoryNotEmptyException(cleartextTarget.toString());
 				}

src/main/java/org/cryptomator/cryptofs/dir/DirIdBackupFilter.java renamed to src/main/java/org/cryptomator/cryptofs/dir/ExcludeDirIdBackupFilter.java

@@ -6,13 +6,11 @@
 import java.nio.file.DirectoryStream;
 import java.nio.file.Path;
 
-public class DirIdBackupFilter implements DirectoryStream.Filter<Path> {
-
-	private final Path skippedEntry = Path.of(Constants.DIR_BACKUP_FILE_NAME);
+public class ExcludeDirIdBackupFilter implements DirectoryStream.Filter<Path> {
 
 	@Override
 	public boolean accept(Path entry) throws IOException {
-		return entry.getFileName().equals(skippedEntry);
+		return !entry.equals(entry.resolveSibling(Constants.DIR_BACKUP_FILE_NAME));
 	}
 
 }