Page not rendering when using SafeArea, Grid with Auto, and ScrollView

[JohnTraDolta]

Description

A page in our .NET MAUI application does not render properly when using a combination of SafeArea, Grid with Auto row definitions, and ScrollView. Initially, it seemed device-dependent, but the issue has been reproduced consistently with a minimal setup. Not all of our users is affected by this, but if they are it can be reproduced every time.

From what i've seen, no error is thrown and no error or warning is printed. Only the UI freezes and my guess is there is some infinite loop running in the layout process.

We have tested with dotnet 8 and 9 multiple versions.

Steps to Reproduce

Steps to reproduce:
pull and run the project
or copy paste problematic xaml

<ContentPage
    x:Class="IOSStrangeMauiBug.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    >
    <Grid IgnoreSafeArea="True" RowDefinitions="auto, *">
        <StackLayout Background="blue" IgnoreSafeArea="True">
            <Label Text="Stack layout label" />
        </StackLayout>
        <ScrollView Grid.Row="1">
            <Label Text="Scroll view label" />
        </ScrollView>
    </Grid>
</ContentPage>

Expected Behavior:
The page should be render.

Actual Behavior:
The page does not render at all and UI thread is frozen.

Link to public reproduction project repository

https://github.com/JohnTraDolta/IOSStrangeMauiBug

Version with bug

9.0.40 SR4

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

Workarounds: (do one of the following)
Change RowDefinition from Auto to *
Remove ScrollView
Remove IgnoreSafeArea="True"

Relevant log output

[PureWeen]

I bet it's related to this

#24246

I still haven't quite cracked this one :-/

[JohnTraDolta]

@PureWeen
It´s sounds like it, was you able to get your example to render?

The odd thing about this issue is that the same page renders on some devices but not others. We were not able to reproduce our production issue with in-house devices. So I visited a customer yesterday, who had the issue, and got it to work there.
After i got back to work i made a new app trying to reproduce the problem, and with this demo app i can reproduce on all devices.

What I saw on the customer's device, was that the app froze. This was the login page so pretty critical for us and our customers.

Don't think this will help in any way, but I find it kind of interesting.

If you need more from me don't hesitate to reach out!

[jsuarezruiz]

Could be fixed by #27043?

Can include:

<ContentPage
    x:Class="IOSStrangeMauiBug.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    >
    <Grid IgnoreSafeArea="True" RowDefinitions="auto, *">
        <StackLayout Background="blue" IgnoreSafeArea="True">
            <Label Text="Stack layout label" />
        </StackLayout>
        <ScrollView Grid.Row="1">
            <Label Text="Scroll view label" />
        </ScrollView>
    </Grid>
</ContentPage>

as a sample to create an UITest verifying the UI?

[Marnie-Majait]

This issue has been verified using Visual Studio 17.14 Preview 1(9.0.40 & 9.0.30 & 9.0.22 & 9.0.0). Can repro this issue on iOS platform.

Actual behavior:

Expected behavior:

[JohnTraDolta]

Could be fixed by #27043?

Can include:

<ContentPage
    x:Class="IOSStrangeMauiBug.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    >
    <Grid IgnoreSafeArea="True" RowDefinitions="auto, *">
        <StackLayout Background="blue" IgnoreSafeArea="True">
            <Label Text="Stack layout label" />
        </StackLayout>
        <ScrollView Grid.Row="1">
            <Label Text="Scroll view label" />
        </ScrollView>
    </Grid>
</ContentPage>

as a sample to create an UITest verifying the UI?

@jsuarezruiz Is this something I should respond to?