avalonia: Fix to ItemCount not refreshing

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

@@ -12,6 +12,7 @@ using Avalonia.VisualTree;
 using CommunityToolkit.Mvvm.Input;
 using InABox.Core;
 using System.Collections;
+using System.Collections.Specialized;
 using System.ComponentModel;
 
 namespace InABox.Avalonia.Components;
@@ -141,7 +142,6 @@ public partial class AvaloniaDataGrid : UserControl, INotifyPropertyChanged
             grid.Grid.CollectionView.CollectionChanged += grid.CollectionView_CollectionChanged;
         }
         grid.ItemsChanged();
-        grid.UpdateSummaryRow();
     }
 
     #endregion
@@ -177,6 +177,7 @@ public partial class AvaloniaDataGrid : UserControl, INotifyPropertyChanged
     private void ItemsChanged()
     {
         ItemCount = (Grid.CollectionView as DataGridCollectionView)?.ItemCount ?? 0;
+        UpdateSummaryRow();
     }
 
     private void Columns_Changed(AvaloniaDataGridColumns columns)