[pull] main from w-ahmad:main

src/TableView.cs

@@ -392,6 +392,11 @@
     /// </summary>
     private void OnLoaded(object sender, RoutedEventArgs e)
     {
+        if (_isItemsSourceSuspended) // indicates that the control was unloaded and loaded back
+        {
+            _headerRow?.CalculateHeaderWidths();  // Needed when switching back to an existing TableView (without provided column Widths)
+        }
+
         ResumeItemsSource();
         EnsureAutoColumns();
     }
@@ -731,7 +736,7 @@
         }
         else
         {
             foreach (var propertyInfo in dataType.GetProperties())
             {
                 var displayAttribute = propertyInfo.GetCustomAttributes().OfType<DisplayAttribute>().FirstOrDefault();
                 var autoGenerateField = displayAttribute?.GetAutoGenerateField();

src/TableViewHeaderRow.cs

@@ -41,6 +41,7 @@ public partial class TableViewHeaderRow : Control
     private Border? _columnDropIndicator;
     private TranslateTransform? _columnDropIndicatorTransform;
     private Image? _dragHeaderImage;
+    private DispatcherTimer? _desiredWidthTimer;
     private bool _calculatingHeaderWidths;
     private int _dropColumnIndex;
     private bool _isValidDropTarget;
@@ -201,6 +202,28 @@ e.PropertyName is nameof(TableViewColumn.IsFrozen)) &&
                 CalculateHeaderWidths();
             }
         }
+        else if (e.PropertyName is nameof(TableViewColumn.DesiredWidth))
+        {
+            // Coalesce multiple updates (see in-loop Measure() call in CalculateHeaderWidths) to avoid excessive header width calculations.
+            _desiredWidthTimer ??= new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(250) };
+            _desiredWidthTimer.Tick -= OnDesiredWidthTimerTick;
+            _desiredWidthTimer.Tick += OnDesiredWidthTimerTick;
+            _desiredWidthTimer.Stop();
+            _desiredWidthTimer.Start();
+        }
+    }
+
+    /// <summary>
+    /// Recalculates header widths after deferred desired-width updates.
+    /// </summary>
+    private void OnDesiredWidthTimerTick(object? sender, object e)
+    {
+        _desiredWidthTimer?.Stop();
+
+        if (!_calculatingHeaderWidths)
+        {
+            CalculateHeaderWidths();
+        }
     }
 
     /// <summary>