FileExplorer: hidden drives are displayed about seb-win-refactoring HOT 5 CLOSED

// uni-goettingen-patch: start
using Microsoft.Win32;
// uni-goettingen-patch: end

namespace SafeExamBrowser.UserInterface.Desktop.Windows
{
	internal partial class FileSystemDialog : Window
	{
		// uni-goettingen-patch: begin
		private DriveInfo[] GetDrives(bool showAll = false)
		{
			var drives = DriveInfo.GetDrives();
			int noDrives = (int)Registry.GetValue("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer", "NoDrives", 0);

			if (noDrives > 0 || showAll)
			{
				return drives.Where(drive => (noDrives & (int)(Math.Pow(2, (int)(drive.RootDirectory.ToString()[0]) - 65))) == 0).ToArray();
			}

			return drives;
		}
		// uni-goettingen-patch: end

		private void InitializeFileSystem()
		{
			// uni-goettingen-patch: begin
			foreach (var drive in GetDrives())
			// uni-goettingen-patch: end
			{
				FileSystem.Items.Add(CreateItem(drive.RootDirectory));
			}

			if (FileSystem.HasItems && FileSystem.Items[0] is TreeViewItem item)
			{
				item.IsSelected = true;
			}

			if (!string.IsNullOrEmpty(initialPath))
			{
				var root = Path.GetPathRoot(initialPath);
				var path = initialPath.Replace(root, "").Split(Path.DirectorySeparatorChar);
				var segments = new List<string> { root };

				segments.AddRange(path);

				SelectInitialPath(FileSystem.Items, segments);

				if (element == FileSystemElement.File && operation == FileSystemOperation.Save)
				{
					NewElementName.Text = Path.GetFileName(initialPath);
				}
			}
		}
	}
}