[Bug] [Shell] First page is null in ShellGroupItem Navigation Stack

[GiampaoloGabba]

Description

When navigating inside Shell, the first page in the ShellGroupItem Navigation Stack is null.
I found this when fixing a bug in my plugin. I have resolved using a quick & dirt reflection hack inside the renderer but i dont like it :)

Having a navigation stack that don't represent the true navigation is a problem.

Steps to Reproduce

I have attached a repro. Just run the project, click on an item to go to the detail page where the Navigation Stack is dumped to a label.

Expected Behavior

First entry in navigation stack should not be null but need to reference to the first page

Actual Behavior

First entry is navigation stack is null :)

Basic Information

• Version with issue: 4.8
• Last known good version: 4.3 (maybe later versions)

Screenshots

Reproduction Link

https://github.com/GiampaoloGabba/ShellTest

[GiampaoloGabba]

Also please note:
when doing Shell.Current.GoToAsync("../") from the second page in the stack, the navigation is firing the PopToRoot event and not Pop. This is not in the repro project but maybe that is correlated to this issue.

[jsuarezruiz]

@GiampaoloGabba Thanks for the repro sample.

[GiampaoloGabba]

@jsuarezruiz i saw you added the p/Android attribute only but this happens in iOS too :)
I think is something related to how the first page is loaded. In the debugger i see that the page assigned to the ShellContent is in the ControlTemplate property (well i dont remember exactly the property name, but is related to "Something"Template) but not in the Page property.

[GiampaoloGabba]

I dug into the issue while making an unrelated pull request and i found that the renderer is creating the page from the DataTemplate (with GetOrCreateContent()) after the page is added to the NavigationStack.

I have no idea how to fix it (i tried something but the result were always a big crash) but at least i found it why :)

[pictos]

@PureWeen do you know how to fix it?

[Freezor]

Is there any update on this? We still got a problem with this in our project.

[haavamoa]

Bump, this is annoying