Make event actually keydown

src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs

@@ -1,9 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reactive.Disposables;
 using System.Reactive.Linq;
-using System.Reactive.Subjects;
 using Avalonia.Controls;
 using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Primitives;
@@ -12,7 +10,6 @@ using Avalonia.Diagnostics.ViewModels;
 using Avalonia.Input;
 using Avalonia.Input.Raw;
 using Avalonia.Markup.Xaml;
-using Avalonia.Media;
 using Avalonia.Styling;
 using Avalonia.VisualTree;
 
@@ -30,6 +27,7 @@ namespace Avalonia.Diagnostics.Views
 
             _keySubscription = InputManager.Instance.Process
                 .OfType<RawKeyEventArgs>()
+                .Where(x => x.Type == RawKeyEventType.KeyDown)
                 .Subscribe(RawKeyDown);
 
             _frozenPopupStates = new Dictionary<Popup, IDisposable>();