chore: adding textBox pointer test

src/SamplesApp/SamplesApp.UITests/Windows_UI_Xaml_Controls/TextBoxTests/TextBoxTests.cs

@@ -6,6 +6,7 @@
 using FluentAssertions;
 using FluentAssertions.Execution;
 using NUnit.Framework;
+using SamplesApp.UITests.Extensions;
 using SamplesApp.UITests.TestFramework;
 using Uno.UITest;
 using Uno.UITest.Helpers;
@@ -992,5 +993,25 @@ public void TextBox_Selection_IsReadOnly()
 			// Final verification of SelectedText
 			Assert.IsNotEmpty(readonlyTextBox.GetDependencyPropertyValue("SelectedText")?.ToString());
 		}
+
+		[Test]
+		[AutoRetry]
+		public void When_ClickAndDrag_SelectsDefaultText()
+		{
+
+			Run("UITests.Shared.Windows_UI_Input.PointersTests.TextBox_Pointer");
+
+			_app.WaitForElement("TestTextBox");
+
+			var textBoxRect = _app.GetPhysicalRect("TestTextBox");
+
+			var startPoint = textBoxRect.GetPointInRect(new System.Drawing.PointF(0.1f, 0.5f));
+			var endPoint = textBoxRect.GetPointInRect(new System.Drawing.PointF(0.9f, 0.5f));
+
+			_app.DragCoordinates(startPoint, endPoint);
+
+			var resultText = _app.GetText("ResultText");
+			Assert.AreEqual("Pointer Released - No text selected", resultText, "Dragging should not select text.");
+		}
 	}
 }

src/SamplesApp/UITests.Shared/Windows_UI_Input/PointersTests/TextBox_Pointer.xaml

@@ -0,0 +1,28 @@
+<Page x:Class="UITests.Shared.Windows_UI_Input.PointersTests.TextBoxPointer"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:local="using:UITests.Shared.Windows_UI_Input.PointersTests"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  mc:Ignorable="d"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<StackPanel>
+		<StackPanel Orientation="Horizontal"
+					Margin="0,20">
+			<Border x:Name="TestTextBoxBorder"
+					Background="LightGray"
+					Width="300"
+					Height="50">
+				<TextBox x:Name="TestTextBox"
+						 Text="Default Text"
+						 VerticalAlignment="Center"
+						 HorizontalAlignment="Center" />
+			</Border>
+
+			<TextBlock x:Name="ResultText"
+					   Text="No action yet"
+					   Margin="10,0,0,0" />
+		</StackPanel>
+	</StackPanel>
+</Page>

src/SamplesApp/UITests.Shared/Windows_UI_Input/PointersTests/TextBox_Pointer.xaml.cs

@@ -0,0 +1,67 @@
+using System;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Input;
+using Uno.UI.Samples.Controls;
+using Windows.Foundation;
+
+namespace UITests.Shared.Windows_UI_Input.PointersTests
+{
+	[Sample("Pointers",Description = "This sample tests an issue where dragging on a TextBox selects text incorrectly. To ensures that dragging across the TextBox does not select text unless explicitly selected.")]
+	public sealed partial class TextBoxPointer : Page
+	{
+		public TextBoxPointer()
+		{
+			this.InitializeComponent();
+			SetupPointerEvents();
+		}
+
+		private void SetupPointerEvents()
+		{
+			TestTextBoxBorder.PointerPressed += OnPointerPressed;
+			TestTextBoxBorder.PointerMoved += OnPointerMoved;
+			TestTextBoxBorder.PointerReleased += OnPointerReleased;
+		}
+
+		private bool _isDragging;
+		private Point? _initialPoint;
+
+		private void OnPointerPressed(object sender, PointerRoutedEventArgs e)
+		{
+			_initialPoint = e.GetCurrentPoint(TestTextBoxBorder).Position;
+			_isDragging = false;
+			ResultText.Text = "Pointer Pressed";
+		}
+
+		private void OnPointerMoved(object sender, PointerRoutedEventArgs e)
+		{
+			if (_initialPoint is Point initialPoint)
+			{
+				var currentPoint = e.GetCurrentPoint(TestTextBoxBorder).Position;
+
+				if (Math.Abs(currentPoint.X - initialPoint.X) > 2 || Math.Abs(currentPoint.Y - initialPoint.Y) > 2)
+				{
+					_isDragging = true;
+					ResultText.Text = "Pointer Dragging";
+				}
+			}
+		}
+
+		private void OnPointerReleased(object sender, PointerRoutedEventArgs e)
+		{
+			if (_isDragging)
+			{
+				var selectedText = TestTextBox.SelectedText;
+				ResultText.Text = string.IsNullOrEmpty(selectedText)
+					? "Pointer Released - No text selected"
+					: $"Pointer Released - Selected Text: '{selectedText}'";
+			}
+			else
+			{
+				ResultText.Text = "Pointer Released - No drag detected";
+			}
+
+			_isDragging = false;
+			_initialPoint = null;
+		}
+	}
+}