Add reproduction for 41153 (#428)

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla41153.cs

@@ -0,0 +1,99 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 41153, "jobject must not be IntPtr.Zero with TabbedPage and ToolbarItems")]
+	public class Bugzilla41153 : TestTabbedPage
+	{
+		MyViewModel _Vm = new MyViewModel();
+		const string Tab1 = "Tab 1";
+		const string Tab1Content = "On Tab 1";
+		const string Tab2 = "Tab 2";
+		const string Tab3 = "Tab 3";
+		const string Tab3Content = "On Tab 3";
+		const string ToolbarItemText = "Toolbar Item";
+		const string Success = "Success";
+
+		[Preserve(AllMembers = true)]
+		class MyViewModel : INotifyPropertyChanged
+		{
+			string _toolBarItemText;
+			public string ToolbarItemText
+			{
+				get
+				{
+					return _toolBarItemText;
+				}
+				set
+				{
+					_toolBarItemText = value;
+					OnPropertyChanged();
+				}
+			}
+
+			ICommand _toolBarItemCommand;
+			public ICommand ToolbarItemCommand
+			{
+				get
+				{
+					if (_toolBarItemCommand == null)
+					{
+						_toolBarItemCommand = new Command(() =>
+						{
+							ToolbarItemText = Success;
+						});
+					}
+
+					return _toolBarItemCommand;
+				}
+			}
+
+			public event PropertyChangedEventHandler PropertyChanged;
+
+			protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+			{
+				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+			}
+		}
+
+		protected override void Init()
+		{
+			var page1 = new ContentPage { Content = new Label { Text = Tab1Content }, BindingContext = _Vm };
+			var toolBarItem = new ToolbarItem();
+			toolBarItem.SetBinding(ToolbarItem.CommandProperty, nameof(MyViewModel.ToolbarItemCommand));
+			toolBarItem.SetBinding(ToolbarItem.TextProperty, nameof(MyViewModel.ToolbarItemText));
+			page1.ToolbarItems.Add(toolBarItem);
+			var page2 = new ContentPage();
+			var page3 = new ContentPage { Content = new Label { Text = Tab3Content } };
+			Children.Add(new NavigationPage(page1) { Title = Tab1 });
+			Children.Add(new NavigationPage(page2) { Title = Tab2 });
+			Children.Add(new NavigationPage(page3) { Title = Tab3 });
+			_Vm.ToolbarItemText = ToolbarItemText;
+		}
+
+#if UITEST
+		[Test]
+		public void Bugzilla41153Test()
+		{
+			RunningApp.WaitForElement(q => q.Marked(Tab1Content));
+			RunningApp.Tap(q => q.Marked(Tab2));
+			RunningApp.Tap(q => q.Marked(Tab3));
+			RunningApp.WaitForElement(q => q.Marked(Tab3Content));
+			RunningApp.Tap(q => q.Marked(Tab1));
+			RunningApp.WaitForElement(q => q.Marked(Tab1Content));
+			RunningApp.Tap(q => q.Marked(ToolbarItemText));
+			RunningApp.WaitForElement(q => q.Marked(Success));
+		}
+#endif
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -189,6 +189,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla43161.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla39768.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla41271.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla41153.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)_Template.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1028.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue1075.cs" />