fix NumberBoxColumn value commit issue

Author: w-ahmad

src/Columns/TableViewNumberColumn.cs

@@ -1,5 +1,6 @@
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using WinUI.TableView.Extensions;
 
 namespace WinUI.TableView;
 
@@ -65,6 +66,8 @@ protected internal override void EndCellEditing(TableViewCell cell, object? data
         {
             if (editAction == TableViewEditAction.Commit)
             {
+                numberBox.UpdateValue();
+
                 var bindingExpression = numberBox.GetBindingExpression(NumberBox.ValueProperty);
                 bindingExpression?.UpdateSource();
             }

src/Extensions/FrameworkElementExtensions.cs

@@ -0,0 +1,25 @@
+using CommunityToolkit.WinUI;
+using Microsoft.UI.Xaml.Controls;
+
+namespace WinUI.TableView.Extensions;
+
+/// <summary>
+/// Provides extension methods for FrameworkElements.
+/// </summary>
+internal static class FrameworkElementExtensions
+{
+    /// <summary>
+    /// NumberBox does not update its Text property automatically until it loses focus in some cases.
+    /// This method forces the NumberBox to update its Text property.
+    /// </summary>
+    /// <param name="numberBox">The NumberBox to update its value.</param>
+    internal static void UpdateValue(this NumberBox numberBox)
+    {
+        var inputTextBox = numberBox.FindDescendant<TextBox>(x => x.Name is "InputBox");
+
+        if (inputTextBox is not null && inputTextBox.Text != numberBox.Text)
+        {
+            numberBox.Text = inputTextBox.Text;
+        }
+    }
+}