[BUG] Android "hardware" back button closes the app when app contains a tabbed page with a navigation page as root page for one of the tabs about prism

[skha83]

Hi @dansiegel, I have tried the navigation changes introduced in version 9.0.436-pre which should resolve this issue. I'm still having problems getting the navigation to work the way I expect it to work.
I have created a fork on the current Prism main and simplified my example so it only contain one tabbed page with a navigation page and two segments here https://github.com/skha83/Prism

The example code is modified like the following:

.CreateWindow(nav => nav.CreateBuilder()
    .AddTabbedSegment(page =>
            page.CreateTab(t =>
                t.AddNavigationPage()
                 .AddSegment("ViewA")
                 .AddSegment("ViewB")))
    .NavigateAsync())

I have two scenarios and both of them fail.

Scenario 1.

1. Deploy and launch the PrismMauiDemo app from my repository on an Android phone.
2. The app is launched with ViewB page on top and ViewA and NavigationPage below.
3. Press the hardware back button.

Expected result:
The app will navigate from ViewB -> ViewA but stay in foreground so ViewA is visible.

Actual result:
The app navigates to ViewA but immediately backgrounds the app. When the app is opened again ViewA is the current window. But the app is not terminated.

Scenario 2.

1. Deploy and launch the PrismMauiDemo app from my repository on an Android phone.
2. The app is launched with ViewB page on top and ViewA and NavigationPage below.
3. Press the software navigate back button on the top left of the app, so it navigates back to ViewA.
4. When ViewA is visible press the hardware back button.

Expected result:
The app will be backgrounded but not completely terminated.

Actual result:
The app gets completely terminated and needs to be relaunched and is started from scratch.

The behavior in scenario 1 is different from before the new changes. Previously it would correctly navigate from ViewB -> ViewA and not background the app if the hardware back button is only pressed once.

Scenario 2 is working in the same way as before the recent changes.

I don't know if I shall create a new issue or this issue can get reopened?