Added a UiTest (#20439)

src/Controls/samples/Controls.Sample.UITests/Issues/Issue20439.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Shell xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue20439"
+             xmlns:ns="clr-namespace:Maui.Controls.Sample.Issues">
+    <ShellContent
+            Title="Home">
+            <ContentPage>
+                <StackLayout VerticalOptions="Center">
+                    <Entry AutomationId="entry" Text="Tap here"/>
+                    <Button AutomationId="button" Text="Open the input page" Clicked="Button_Clicked"/>
+                </StackLayout>
+            </ContentPage>
+        </ShellContent>
+
+        <ShellContent
+            Title="Text input page">
+            <ContentPage>
+                   <Editor VerticalOptions="Center"
+                           AutomationId="editor"
+                           HeightRequest="100"
+                           Text="Potential auto correcting words: -- :-) ... omw \n" />
+            </ContentPage>
+        </ShellContent>
+</Shell>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue20439.xaml.cs

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+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 20439, "[iOS] Double dash in Entry or Editor crashes the app", PlatformAffected.iOS)]
+	public partial class Issue20439 : Shell
+	{
+		public Issue20439()
+		{
+			InitializeComponent();
+		}
+
+		void Button_Clicked(object sender, System.EventArgs e)
+		{
+			CurrentItem = Items[1];
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue20439.cs

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+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue20439 : _IssuesUITest
+	{
+		public override string Issue => "[iOS] Double dash in Entry or Editor crashes the app";
+
+		public Issue20439(TestDevice device) : base(device)
+		{
+		}
+
+		[Test]
+		public void ErrorShouldNotBeThrown()
+		{
+			this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.Android, TestDevice.Mac, TestDevice.Windows });
+
+			_ = App.WaitForElement("entry");
+			App.Click("entry");
+			App.Click("button");
+
+			// The test passes if no crash is observed
+			App.FindElement("editor");
+		}
+	}
+}