Fix focusing and clipboard use

src/ViewModels/MainViewModel.cs

@@ -29,6 +29,7 @@ using SixLabors.ImageSharp.Processing;
 using System.Reflection.Metadata.Ecma335;
 using Docnet.Core.Readers;
 using MigraDoc.DocumentObjectModel.Visitors;
+using Avalonia.Input.Platform;
 
 namespace MayShow.ViewModels;
 

src/Views/MainView.axaml.cs

@@ -27,7 +27,7 @@ public partial class MainView : UserControl
     public void UnfocusTextbox()
     {
         var topLevel = TopLevel.GetTopLevel(this);
-        topLevel?.FocusManager?.ClearFocus();
+        topLevel?.FocusManager?.Focus(null);
         if (DataContext is MainViewModel mvm)
         {
             mvm?.HasUnsavedWork = true;