compile fix - ArgumentNullException.ThrowIfNull (net standard 2.0 fail)
compile fix - ArgumentNullException.ThrowIfNull (net standard 2.0 fail)

SuperJMN/Avalonia,grokys/Perspex,SuperJMN/Avalonia,grokys/Perspex,SuperJMN/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia