Move TitleViewSetOnShellWorksAfterNavigation to Appium (#25094)

* Move TitleViewSetOnShellWorksAfterNavigation to Appium

* - give width to editor so that it's visible

src/Controls/tests/TestCases.HostApp/Issues/Issue12888.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.CustomAttributes;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 12888,
+		"Fix timing on iOS Toolbar",
+		PlatformAffected.iOS)]
+	public class Issue12888 : Shell
+	{
+		const string Success = "Success";
+		const string Show = "Show";
+
+        public Issue12888()
+        {
+            var page1 = CreatePage("Item 1");
+			var page2 = CreatePage("Item 2");
+
+			var shellTitleView = 
+                new HorizontalStackLayout()
+                {
+                    new Editor() { AutomationId = "Success", WidthRequest = 100},
+                    new Label() { Text = "Title View" },
+                };
+
+            Shell.SetTitleView(this, shellTitleView);
+            this.Items.Add(new TabBar()
+            {
+                Items =
+                {
+                    new ShellContent()
+                    {
+                        Route = "Item1",
+                        Content = page1,
+                        Title = "Item 1"
+                    },
+                    new ShellContent()
+                    {
+                        Route = "Item2",
+                        Content = page2,
+                        Title = "Item 2"
+                    },
+                }
+            });
+        }
+
+        ContentPage CreatePage(string title)
+        {
+            return new ContentPage()
+            {
+                Title = title,
+                Content = new StackLayout()
+                {
+                    Children =
+                    {
+                        new Label() { Text = "Click on different buttons to navigate around shell. The TitleView should remain in place as you navigate" },
+                        new Button() { Text = "Go to Item 1", Command = new Command(async () => await this.GoToAsync("//Item1")), AutomationId = "GoToItem1" },
+                        new Button() { Text = "Go to Item 2", Command = new Command(async () => await this.GoToAsync("//Item2")), AutomationId = "GoToItem2" },
+                        new Button() { Text = "Push New Page", 
+                            Command = 
+                                new Command(async () => await this.Navigation.PushAsync(CreatePage($"Pushed Page: {DateTime.Now.ToLongTimeString()}"))), 
+                                    AutomationId = "PushPage" },
+                        new Button() { Text = "Pop Page", Command = new Command(async () => await this.Navigation.PopAsync()), AutomationId = "PopPage" },
+                    }
+                }
+            };
+        }
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue12888.cs

@@ -0,0 +1,37 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue12888 : _IssuesUITest
+	{
+		public Issue12888(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Fix timing on iOS Toolbar";
+
+		[Category(UITestCategories.Shell)]
+		[Test(Description = "TitleView Set On Shell Works After Navigation")]
+		public void TitleViewSetOnShellWorksAfterNavigation()
+		{
+			App.WaitForElement("Success");
+
+			App.Click("GoToItem2");
+			App.WaitForElement("Success");
+
+			App.Click("GoToItem1");
+			App.WaitForElement("Success");
+
+			App.Click("GoToItem2");
+			App.WaitForElement("Success");
+
+			App.Click("PushPage");
+			App.WaitForElement("Success");
+
+			App.Click("PopPage");
+			App.WaitForElement("Success");
+		}
+	}
+}