avalonia: Fixed Datagrid record counter

InABox.Avalonia/Components/AvaloniaDataGrid/AvaloniaDataGrid.axaml.cs

@@ -127,6 +127,7 @@ public partial class AvaloniaDataGrid : UserControl, INotifyPropertyChanged
             grid.Grid.CollectionView.CollectionChanged -= grid.CollectionView_CollectionChanged;
             grid.Grid.CollectionView.CollectionChanged += grid.CollectionView_CollectionChanged;
         }
+        grid.ItemsChanged();
         grid.UpdateSummaryRow();
     }
 
@@ -141,6 +142,11 @@ public partial class AvaloniaDataGrid : UserControl, INotifyPropertyChanged
     }
 
     private void CollectionView_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
+    {
+        ItemsChanged();
+    }
+
+    private void ItemsChanged()
     {
         ItemCount = (Grid.CollectionView as DataGridCollectionView)?.ItemCount ?? 0;
     }