Describe the bug

On main, the below code generates public partial string Foo ... which yields this error:

CS9257: "Both partial property declarations must be required or neither may be required"

It should generate public required partial string Foo ... instead.

public partial class Test : ObservableObject
{
    [ObservableProperty]
    public required partial string Foo { get; set; }
}

Steps to reproduce

1. Run dotnet pack src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj (on the current main)
2. Create a WPF App (.NET 8)
3. Install the package generated by step 1
4. Add <LangVersion>preview</LangVersion> to the .csproj
5. Create a class as follows:

using CommunityToolkit.Mvvm.ComponentModel;

namespace WpfApp1;

public partial class Test : ObservableObject
{
    [ObservableProperty]
    public required partial string Foo { get; set; }
}

Expected behavior

public partial class Test : ObservableObject
{
    [ObservableProperty]
    public required partial string Foo { get; set; }
}

Generates public required partial string Foo ... instead of public partial string Foo ...

IDE and version

VS 2022

IDE version

17.11.5

Nuget packages

• CommunityToolkit.Common
• CommunityToolkit.Diagnostics
• CommunityToolkit.HighPerformance
• CommunityToolkit.Mvvm (aka MVVM Toolkit)

Nuget package version(s)

main (8.4.0-build.11)

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