[iOS] FormattedText with text color causes stack overflow - fix (#29874)

Author: kubaflo

src/Controls/src/Core/Label/Label.iOS.cs

@@ -42,7 +42,7 @@ internal static void MapFormatting(ILabelHandler handler, Label label)
 			{
 				LabelHandler.MapFormatting(handler, label);
 			}
-			else
+			else if (!label.HasFormattedTextSpans && label.TextType == TextType.Html) // we need to re-apply color and font for HTML labels
 			{
 				handler.UpdateValue(nameof(ILabel.TextColor));
 				handler.UpdateValue(nameof(ILabel.Font));

src/Controls/tests/TestCases.HostApp/Issues/Issue29851.cs

@@ -0,0 +1,23 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 29851, "[iOS] FormattedText with text color causes stack overflow", PlatformAffected.All)]
+public class Issue29851 : TestContentPage
+{
+	protected override void Init()
+	{
+		Content = new Label
+		{
+			AutomationId = "label",
+			TextColor = Colors.Green,
+			FormattedText = new FormattedString
+			{
+				Spans =
+				{
+					new Span { Text = "Hello, World!" },
+					new Span { Text = "*", TextColor = Colors.Red }
+				}
+			}
+		};
+		;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue29851.cs

@@ -0,0 +1,20 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue29851 : _IssuesUITest
+{
+
+	public Issue29851(TestDevice testDevice) : base(testDevice) { }
+
+	public override string Issue => "[iOS] FormattedText with text color causes stack overflow";
+
+	[Test]
+	[Category(UITestCategories.Label)]
+	public void FormattedTextWithTextColorDoesNotCrash()
+	{
+		App.WaitForElement("label");
+	}
+}