Fix: Fixed a crash with ftp connections (#12228)

Author: ferrariofilippo

src/Files.App/ViewModels/ItemViewModel.cs

@@ -139,7 +139,11 @@ public async Task SetWorkingDirectoryAsync(string? value)
 				_ = Task.Run(() => jumpListService.AddFolderAsync(value));
 
 			WorkingDirectory = value;
-			GitDirectory = GitHelpers.GetGitRepositoryPath(WorkingDirectory, Path.GetPathRoot(WorkingDirectory));
+
+			var pathRoot = FtpHelpers.IsFtpPath(WorkingDirectory) 
+				? WorkingDirectory.Substring(0, FtpHelpers.GetRootIndex(WorkingDirectory)) 
+				: Path.GetPathRoot(WorkingDirectory);
+			GitDirectory = pathRoot is null ? null : GitHelpers.GetGitRepositoryPath(WorkingDirectory, pathRoot);
 			OnPropertyChanged(nameof(WorkingDirectory));
 		}