Uno.CommunityToolkit.WinUI.UI.Controls.LayoutTransformControl throws System.InvalidOperationException: [LayoutTransformControl-56242/: Invalid measured size -Infinity,-Infinity. NaN or Infinity are invalid desired size

Current behavior

Integrating LayoutTransformControl in your Wasm project, will throw 'System.InvalidOperationException: [LayoutTransformControl-56242/: Invalid measured size -Infinity,-Infinity. NaN or Infinity are invalid desired size' on startup

Expected behavior

No exceptions

How to reproduce it (as minimally and precisely as possible)

Create a normal Uno WASM project
Add 'Uno.CommunityToolkit.WinUI.UI.Controls' to your WASM project

Add 'LayoutTransformControl' to your MainPage.xaml

<Page
x:Class="TransformLayout.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:TransformLayout"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:controls="clr-namespace:CommunityToolkit.WinUI.UI.Controls;assembly=CommunityToolkit.WinUI.UI.Controls"
mc:Ignorable="d"    
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

<Grid>
    <controls:LayoutTransformControl >
        <TextBlock x:Name="txtblock" Text="Hello, world!" Margin="20" FontSize="30" />
    </controls:LayoutTransformControl>
</Grid>
</Page>

In the TransformLayoutContro.MeasureOverride(size) method the control tries to get the Child property, which is null in this moment. On the Loading-Event there is still a valid Child tho.

Workaround

Set a 'Loaded' Event for the LayoutTransformControl and set the Child programmatically:

<controls:LayoutTransformControl Loaded="LayoutTransformControl_Loaded">

private void LayoutTransformControl_Loaded(object sender, RoutedEventArgs e)
{
        if (sender is LayoutTransformControl ltc)
                ltc.Child = txtblock;
}

Works on UWP/WinUI

Yes

Environment

Other

NuGet package version(s)

uno.communitytoolkit.winui.ui.controls - 7.1.100

Affected platforms

WebAssembly

IDE

Visual Studio 2022

IDE version

Version 17.3.6

Relevant plugins

No response

Anything else we need to know?