[Windows/Android] Fix Dynamic ShellContent Title Updates at Runtime

src/Controls/src/Core/Compatibility/Handlers/Shell/Android/ShellSectionRenderer.cs

@@ -267,6 +267,22 @@ protected virtual void OnItemsCollectionChanged(object sender, NotifyCollectionC
 				adapter.OnItemsCollectionChanged(sender, e);
 				SafeNotifyDataSetChanged();
 			}
+
+			if (e.OldItems is not null)
+			{
+				foreach (ShellContent item in e.OldItems)
+				{
+					item.PropertyChanged -= OnShellContentPropertyChanged;
+				}
+			}
+
+			if (e.NewItems is not null)
+			{
+				foreach (ShellContent item in e.NewItems)
+				{
+					item.PropertyChanged += OnShellContentPropertyChanged;
+				}
+			}
 		}
 
 		void SafeNotifyDataSetChanged(int iteration = 0)

src/Controls/src/Core/Handlers/Shell/ShellContentHandler.Windows.cs

@@ -7,7 +7,7 @@ namespace Microsoft.Maui.Controls.Handlers
 	public partial class ShellContentHandler : ElementHandler<ShellContent, FrameworkElement>
 	{
 		public static PropertyMapper<ShellContent, ShellContentHandler> Mapper =
-				new PropertyMapper<ShellContent, ShellContentHandler>(ElementMapper) { [nameof(ShellContent.Title)] = MapTitle };
+				new PropertyMapper<ShellContent, ShellContentHandler>(ElementMapper);
 
 		public static CommandMapper<ShellContent, ShellContentHandler> CommandMapper =
 				new CommandMapper<ShellContent, ShellContentHandler>(ElementCommandMapper);
@@ -16,14 +16,6 @@ public ShellContentHandler() : base(Mapper, CommandMapper)
 		{
 		}
 
-		internal static void MapTitle(ShellContentHandler handler, ShellContent item)
-		{
-			var shellSection = item.Parent as ShellSection;
-			var shellItem = shellSection?.Parent as ShellItem;
-			var shellItemHandler = shellItem?.Handler as ShellItemHandler;
-			shellItemHandler?.UpdateTitle();
-		}
-
 		protected override FrameworkElement CreatePlatformElement()
 		{
 			return (VirtualView as IShellContentController).GetOrCreateContent().ToPlatform(MauiContext);

src/Controls/src/Core/Handlers/Shell/ShellSectionHandler.Windows.cs

@@ -3,6 +3,7 @@
 using System.Collections.Specialized;
 using System.Text;
 using Microsoft.Maui.Controls.Internals;
+using Microsoft.Maui.Controls.Platform;
 using WFrame = Microsoft.UI.Xaml.Controls.Frame;
 
 
@@ -61,6 +62,14 @@ public override void SetVirtualView(Maui.IElement view)
 				{
 					shell.RemoveAppearanceObserver(this);
 				}
+
+				foreach (var item in _shellSection.Items)
+				{
+					if (item is ShellContent shellContent)
+					{
+						shellContent.PropertyChanged -= OnShellContentPropertyChanged;
+					}
+				}
 				_lastShell = null;
 			}
 
@@ -93,6 +102,14 @@ public override void SetVirtualView(Maui.IElement view)
 					_lastShell = new WeakReference(shell);
 					shell.AddAppearanceObserver(this, _shellSection);
 				}
+
+				foreach (var item in _shellSection.Items)
+				{
+					if (item is ShellContent shellContent)
+					{
+						shellContent.PropertyChanged += OnShellContentPropertyChanged;
+					}
+				}
 			}
 		}
 
@@ -110,6 +127,33 @@ void OnItemsCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e
 			{
 				shellItemHandler.MapMenuItems();
 			}
+
+			if (e.OldItems is not null)
+			{
+				foreach (ShellContent item in e.OldItems)
+				{
+					item.PropertyChanged -= OnShellContentPropertyChanged;
+				}
+			}
+
+			if (e.NewItems is not null)
+			{
+				foreach (ShellContent item in e.NewItems)
+				{
+					item.PropertyChanged += OnShellContentPropertyChanged;
+				}
+			}
+		}
+
+		void OnShellContentPropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
+		{
+			if (sender is not ShellContent shellContent)
+				return;
+
+			if (e.PropertyName == nameof(ShellContent.Title))
+			{
+				shellContent.UpdateTitle();
+			}
 		}
 
 		void SyncNavigationStack(bool animated, NavigationRequestedEventArgs? e)

src/Controls/src/Core/Platform/Windows/Extensions/ShellContentExtension.cs

@@ -0,0 +1,15 @@
+using Microsoft.Maui.Controls.Handlers;
+
+namespace Microsoft.Maui.Controls.Platform
+{
+    internal static class ShellContentExtension
+    {
+		internal static void UpdateTitle(this ShellContent shellContent)
+		{
+			if (shellContent.Parent is ShellSection shellSection && shellSection.Parent is ShellItem shellItem && shellItem.Handler is ShellItemHandler shellItemHandler)
+			{
+				shellItemHandler.UpdateTitle();
+			}
+		}
+    }
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue26049.xaml.cs

@@ -1,6 +1,6 @@
 namespace Maui.Controls.Sample.Issues;
 
-[Issue(IssueTracker.Github, 26049, "[iOS] Fix ShellContent Title Does Not Update at Runtime", PlatformAffected.iOS | PlatformAffected.macOS)]
+[Issue(IssueTracker.Github, 26049, "Fix ShellContent Title Does Not Update at Runtime", PlatformAffected.All)]
 public partial class Issue26049 : Shell
 {
 	ShellContent _dynamicShellContent;

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue26049.cs

@@ -1,4 +1,3 @@
-#if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_WINDOWS   //More information - https://github.com/dotnet/maui/issues/27494
 using NUnit.Framework;
 using UITest.Appium;
 using UITest.Core;
@@ -11,36 +10,47 @@ public Issue26049(TestDevice device) : base(device)
 		{
 		}
 
-		public override string Issue => "[iOS] Fix ShellContent Title Does Not Update at Runtime";
+		public override string Issue => "Fix ShellContent Title Does Not Update at Runtime";
 
 		[Test, Order(1)]
 		[Category(UITestCategories.Shell)]
 		public void VerifyFirstShellContentTitle()
 		{
 			App.WaitForElement("ChangeShellContentTitle");
 			App.Click("ChangeShellContentTitle");
+			TabNavigationViewItemIfWindows();
 			VerifyScreenshot();
 		}
 
 		[Test, Order(2)]
 		[Category(UITestCategories.Shell)]
 		public void VerifyNewlyAddedShellContentTitle()
 		{
+			TabNavigationViewItemIfWindows();
 			App.WaitForElement("AddShellContent");
 			App.Click("AddShellContent");
 			App.Click("UpdateNewShellContentTitle");
+			TabNavigationViewItemIfWindows();
 			VerifyScreenshot();
 		}
 
 		[Test, Order(3)]
 		[Category(UITestCategories.Shell)]
 		public void VerifyExistingTabTitle()
 		{
+			TabNavigationViewItemIfWindows();
 			App.WaitForElement("RemoveShellContent");
 			App.Click("RemoveShellContent");
 			App.Click("UpdateThirdTabTitle");
+			TabNavigationViewItemIfWindows();
 			VerifyScreenshot();
 		}
+
+		void TabNavigationViewItemIfWindows()
+		{
+#if WINDOWS
+			App.Tap("navViewItem");
+#endif
+		}
 	}
-}
-#endif
+}