[Windows] Remove workaround for label text decorations

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue21787.cs

@@ -0,0 +1,23 @@
+#if WINDOWS
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue21787 : _IssuesUITest
+{
+	public Issue21787(TestDevice device) : base(device) { }
+
+	public override string Issue => "[Windows] Remove workaround for label text decorations";
+
+	[Test]
+	public void LabelTextDecorationsWorks()
+	{
+		App.WaitForElement("TestButton");
+		App.Tap("TestButton");
+
+		VerifyScreenshot();
+	}
+}
+#endif

src/Controls/tests/TestCases/Issues/Issue21787.xaml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="Maui.Controls.Sample.Issues.Issue21787">
+  <VerticalStackLayout>
+    <Label 
+      x:Name="TestLabel"
+      AutomationId="TestLabel"
+      Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit."/>
+    <Button 
+      AutomationId="TestButton"
+      Text="Update" 
+      Clicked="OnUpdateButtonClicked"/>
+  </VerticalStackLayout>
+</ContentPage>

src/Controls/tests/TestCases/Issues/Issue21787.xaml.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.None, 21787, "[Windows] Remove workaround for label text decorations", PlatformAffected.UWP)]
+	public partial class Issue21787 : ContentPage
+	{
+		int _counter;
+
+		public Issue21787()
+		{
+			InitializeComponent();
+
+			BindingContext = new ViewModel5354();
+		}
+
+		void OnUpdateButtonClicked(object sender, EventArgs e)
+		{
+			_counter++;
+
+			if (_counter % 2 == 1)
+				TestLabel.TextDecorations = TextDecorations.Underline | TextDecorations.Strikethrough;
+			else
+				TestLabel.TextDecorations = TextDecorations.None;
+		}
+	}
+}

src/Core/src/Platform/Windows/TextBlockExtensions.cs

@@ -52,32 +52,6 @@ public static void UpdateTextDecorations(this TextBlock platformControl, ILabel
 				platformControl.TextDecorations &= ~global::Windows.UI.Text.TextDecorations.Strikethrough;
 			else
 				platformControl.TextDecorations |= global::Windows.UI.Text.TextDecorations.Strikethrough;
-
-			// TextDecorations are not updated in the UI until the text changes
-			if (platformControl.Inlines != null && platformControl.Inlines.Count > 0)
-			{
-				foreach (var inline in platformControl.Inlines)
-				{
-					if (inline is Run run)
-					{
-						run.Text = run.Text;
-					}
-					else if (inline is Span span)
-					{
-						foreach (var inline2 in span.Inlines)
-						{
-							if (inline2 is Run run2)
-							{
-								run2.Text = run2.Text;
-							}
-						}
-					}
-				}
-			}
-			else
-			{
-				platformControl.Text = platformControl.Text;
-			}
 		}
 
 		public static void UpdateLineHeight(this TextBlock platformControl, ILabel label)