newValue argument as Ref for *Changing() generated methods

[Gabboxl]

Overview

Hi, I'm migrating some old C# ViewModel code to use the [ObservableProperty] attribute on all the properties.

I'd like to convert the following code:

private string _windowTitle;
public string WindowTitle {
  get {
    return _windowTitle;
  }
  set {
    _windowTitle = $ "Window title prefix: {value}";
    OnPropertyChanged(nameof(WindowTitle));
  }
}

...but I couldn't find any "simple" or "standard" method to accomplish the same behavior using the MVVM Toolkit.

I discovered that recently the methods *Changing(string? newValue) or *Changing(string? oldValue, string newValue) got added, but the newValue isn't passed as ref string, so I can't intercept and change the value.

Could this prototype be implemented for those methods? Thanks!

API breakdown

partial void OnWindowTitleChanging(ref string value);
partial void OnWindowTitleChanging(string? oldValue, ref string newValue);

Usage example

partial void OnWindowTitleChanging(string? oldValue, ref string newValue)
{
    newValue = "Window title prefix: " + newValue;
}

Breaking change?

I'm not sure

Alternatives

Additional context

No response

Help us help you

No, just wanted to propose this