[Windows] Fix for MenuFlyoutItem displaying icon in monochrome instead of original colors

src/Controls/tests/TestCases.HostApp/Issues/Issue16119.cs

@@ -0,0 +1,52 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 16119, "MenuFlyoutItem with FileImageSource displays icon in monochrome instead of original colors", PlatformAffected.UWP)]
+public class Issue16119 : TestShell
+{
+	protected override void Init()
+	{
+		MenuBarItem menuBarItem = new MenuBarItem { Text = "Menu Flyout Item" };
+
+		MenuFlyoutItem menuFlyoutItem = new MenuFlyoutItem
+		{
+			Text = "Hello World",
+			IconImageSource = new FileImageSource { File = "small_dotnet_bot.png" }
+		};
+		menuBarItem.Add(menuFlyoutItem);
+
+		MenuFlyoutSubItem menuFlyoutSubItem = new MenuFlyoutSubItem
+		{
+			Text = "Sub Menu",
+			IconImageSource = new FileImageSource { File = "small_dotnet_bot.png" }
+		};
+
+		menuFlyoutSubItem.Add(new MenuFlyoutItem
+		{
+			Text = "Sub Item 1",
+			IconImageSource = new FileImageSource { File = "small_dotnet_bot.png" }
+		});
+
+		menuBarItem.Add(menuFlyoutSubItem);
+		MenuBarItems.Add(menuBarItem);
+
+		VerticalStackLayout layout = new VerticalStackLayout
+		{
+			Padding = new Thickness(30, 0),
+			Spacing = 25,
+			VerticalOptions = LayoutOptions.Center,
+			Children =
+			{
+				new Label
+				{
+					AutomationId = "Issue16119DescriptionLabel",
+					Text = "The test passes if the MenuFlyoutItem and MenuFlyoutSubItem icons are in original color instead of monochrome",
+					HorizontalOptions = LayoutOptions.Center,
+					FontSize = 12
+				},
+			}
+		};
+
+		AddContentPage(new ContentPage { Content = layout });
+		FlyoutBehavior = FlyoutBehavior.Disabled;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue16119.cs

@@ -0,0 +1,27 @@
+#if WINDOWS  //Menu bar items only for desktop apps. For more information : https://learn.microsoft.com/en-us/dotnet/maui/user-interface/menu-bar?view=net-maui-9.0                                                                                                                                                          
+//On MacCatalyst, menu items are part of the native macOS menu bar (e.g., Apple, File, Edit) at the top of the screen. So this is not implemented for Mac
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue16119 : _IssuesUITest
+{
+	public override string Issue => "MenuFlyoutItem with FileImageSource displays icon in monochrome instead of original colors";
+
+	public Issue16119(TestDevice device) : base(device)
+	{
+	}
+
+	[Test]
+	[Category(UITestCategories.Page)]
+	public void VerifyMenuFlyoutIconDisplaysOriginalColor()
+	{
+		App.WaitForElement("Issue16119DescriptionLabel");
+		App.Tap("Menu Flyout Item");
+
+		VerifyScreenshot();
+	}
+}
+#endif

src/Core/src/Handlers/MenuFlyoutItem/MenuFlyoutItemHandler.Windows.cs

@@ -28,8 +28,15 @@ void OnClicked(object sender, UI.Xaml.RoutedEventArgs e)
 
 		public static void MapSource(IMenuFlyoutItemHandler handler, IMenuFlyoutItem view)
 		{
-			handler.PlatformView.Icon =
-				view.Source?.ToIconSource(handler.MauiContext!)?.CreateIconElement();
+			var iconSource = view.Source?.ToIconSource(handler.MauiContext!);
+
+			// Ensure MenuFlyoutItem icons preserve original colors instead of showing as monochrome silhouettes
+			if (iconSource is BitmapIconSource bitmapIconSource)
+			{
+				bitmapIconSource.ShowAsMonochrome = false;
+			}
+
+			handler.PlatformView.Icon = iconSource?.CreateIconElement();
 		}
 
 		public static void MapText(IMenuFlyoutItemHandler handler, IMenuFlyoutItem view)

src/Core/src/Handlers/MenuFlyoutSubItem/MenuFlyoutSubItemHandler.Windows.cs

@@ -58,8 +58,14 @@ public static void MapIsEnabled(IMenuFlyoutSubItemHandler handler, IMenuFlyoutSu
 
 		public static void MapSource(IMenuFlyoutSubItemHandler handler, IMenuFlyoutSubItem view)
 		{
-			handler.PlatformView.Icon =
-				view.Source?.ToIconSource(handler.MauiContext!)?.CreateIconElement();
+			var iconSource = view.Source?.ToIconSource(handler.MauiContext!);
+
+			if (iconSource is BitmapIconSource bitmapIconSource)
+			{
+				bitmapIconSource.ShowAsMonochrome = false;
+			}
+
+			handler.PlatformView.Icon = iconSource?.CreateIconElement();
 		}
 
 		public override void SetVirtualView(IElement view)