fix: fixed datagrid small style invalid sometimes issue.

src/Shared/HandyControl_Shared/Controls/Attach/DataGridAttach.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System.Collections.Specialized;
+using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
@@ -17,9 +18,17 @@ public class DataGridAttach
         var grid = (DataGrid) d;
         if ((bool) e.NewValue)
         {
-            if (grid.AutoGenerateColumns)
+            grid.Columns.CollectionChanged += OnDataGridColumnsCollectionChanged;
+        }
+        else
+        {
+            grid.Columns.CollectionChanged -= OnDataGridColumnsCollectionChanged;
+        }
+
+        void OnDataGridColumnsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (e.Action is NotifyCollectionChangedAction.Remove or NotifyCollectionChangedAction.Move)
             {
-                grid.AutoGeneratedColumns += Grid_AutoGeneratedColumns;
                 return;
             }
 
@@ -27,18 +36,6 @@ public class DataGridAttach
             UpdateComboBoxColumnStyles(grid);
             UpdateCheckBoxColumnStyles(grid);
         }
-        else
-        {
-            grid.AutoGeneratedColumns -= Grid_AutoGeneratedColumns;
-        }
-    }
-
-    private static void Grid_AutoGeneratedColumns(object sender, System.EventArgs e)
-    {
-        var grid = (DataGrid) sender;
-        UpdateTextColumnStyles(grid);
-        UpdateComboBoxColumnStyles(grid);
-        UpdateCheckBoxColumnStyles(grid);
     }
 
     public static void SetApplyDefaultStyle(DependencyObject element, bool value)