[Bug]: Nullable partial properties with ObservableAsProperty are not updated with null value

[X3oNZ]

Describe the bug 🐞

Source Generator for nullable partial ObservableAsProperty emits code that won't allow value to be updated with null value; while the last non-null value remains.

Step to reproduce

Property:

[ObservableAsProperty]
public partial string? Test { get; }

Generated Code:

private string? _test;

private readonly ReactiveUI.ObservableAsPropertyHelper<string?> _testHelper;

[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public partial string? Test { get => _test = _testHelper?.Value ?? _test; }

In above case value is updated and .ToProperty is called with null value; value is not updated and previous non-null value remains.

Reproduction repository

https://github.com/reactiveui/ReactiveUI

Expected behavior

Expected code generation for nullable property should be:

private string? _test;

private readonly ReactiveUI.ObservableAsPropertyHelper<string?> _testHelper;

[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public partial string? Test { get => _test = _testHelper?.Value; }

Screenshots 🖼️

No response

IDE

Visual Studio 2022

Operating system

Windows

Version

2.1.8

Device

No response

ReactiveUI Version

20.1.63

Additional information ℹ️

The above provided bug may not evet be a bug but expected behaviour. I encountered it while developing my application and property was behaving unexpectedly while being updated with null value.

[ChrisPulman]

Please update to V2.1.27, this issue should now be resolved, thank you.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.