Use TempPath for WebView

Elwig/App.xaml.cs

@@ -17,6 +17,7 @@ namespace Elwig {
 
         public static readonly string DataPath = @"C:\ProgramData\Elwig\";
         public static readonly string ExePath = @"C:\Program Files\Elwig\";
+        public static readonly string TempPath = Path.Combine(Path.GetTempPath(), "Elwig");
         public static readonly Config Config = new(DataPath + "config.ini");
 
         public static string ZwstId { get; private set; }
@@ -35,7 +36,7 @@ namespace Elwig {
 
         public App() : base() {
             System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
-            Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), "Elwig"));
+            Directory.CreateDirectory(App.TempPath);
             Directory.CreateDirectory(DataPath);
             MainDispatcher = Dispatcher;
             Scales = Array.Empty<IScale>();

Elwig/Helpers/TempFile.cs

@@ -8,7 +8,7 @@ namespace Elwig.Helpers {
 
         public TempFile() : this(null) { }
 
-        public TempFile(string? ext) : this(Path.Combine(Path.GetTempPath(), "Elwig"), ext) { }
+        public TempFile(string? ext) : this(App.TempPath, ext) { }
 
         public TempFile(string dir, string? ext) {
             FilePath = Path.Combine(dir, Path.GetRandomFileName().Replace(".", "") + (ext != null ? $".{ext}" : ""));

Elwig/Windows/DocumentViewerWindow.xaml.cs

@@ -6,11 +6,21 @@ namespace Elwig.Windows {
     public partial class DocumentViewerWindow : Window {
 
         private TempFile? PdfFile = null;
+        private string? PdfPath = null;
 
         public DocumentViewerWindow(string title, string path) {
             InitializeComponent();
             Title = $"{title} - {Title}";
-            WebView.Source = new($"file://{path}#view=FitH");
+            PdfPath = path;
+            InitializeWebView();
+        }
+
+        public async void InitializeWebView() {
+            WebView.CreationProperties = new() {
+                UserDataFolder = App.TempPath,
+            };
+            await WebView.EnsureCoreWebView2Async();
+            WebView.Source = new($"file://{PdfPath}#view=FitH");
         }
 
         public DocumentViewerWindow(string title, TempFile file) : this(title, file.FilePath) {
@@ -22,6 +32,7 @@ namespace Elwig.Windows {
             WebView.Dispose();
             PdfFile?.Dispose();
             PdfFile = null;
+            PdfPath = null;
         }
     }
 }