TabbedPage: WinUI: Back-button persists when swapping to a Tab that does not have a NavigationPage.

[Keflon]

Description

Given a TabbedPage with Children, where

• at least one Tab does not have a NavigationPage
• at least one Tab does have a NavigationPage

If a back button is shown for the CurrentPage, then swapping to a Tab that does not have a NavigationPage does not remove the back button.

Notes:
Swapping to a Tab that does have a NavigationPage correctly updates the back-button depending on whether the current NavigationPage requires it.

Steps to Reproduce

1. Create a new MAUI app.
2. Replace the contents of App.xaml.cs with this:

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        var tabbedPage = new TabbedPage();
        tabbedPage.Children.Add(new ContentPage() { Title = "No Nav root" });
        tabbedPage.Children.Add(new NavigationPage(new NavContentPage()){ Title = "Has Nav root" });
        tabbedPage.Children.Add(new NavigationPage(new NavContentPage()){ Title = "Has Nav root" });
        MainPage = tabbedPage;
    }

    public class NavContentPage : ContentPage
    {
        public NavContentPage()
        {
            var button = new Button() { Text = "Push a page", VerticalOptions = LayoutOptions.Start };
            button.Clicked += (s, e) => { this.Navigation.PushAsync(new NavContentPage()); };
            Content = button;
        }
    }
}

1. Run it on Windows.

2. Swap to either the second or third Tab.

3. Click the button

4. The back button appears. This is correct.
   

5. Swap to the first Tab.

6. The back-button remains. This is the bug.
   

Link to public reproduction project repository

https://github.com/Keflon/TabbedPageNavBug

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Latest

Did you find any workaround?

No.

Relevant log output

No response

[XamlTest]

Verified this on Visual Studio Enterprise 17.7.0 Preview 2.0. Repro on Windows 11, not repro on Android 13.0-API33 and iOS 16.4 with below Project:
TabbedPageNavBug.zip