[XSG] NaN value in XAML generates invalid code

[StephaneDelcroix]

Description

When a XAML file contains NaN as a value (e.g., Padding="NaN"), the XAML Source Generator generates invalid C# code using bare NaN instead of double.NaN.

Steps to Reproduce

1. Create a XAML file with:

<Button Padding="NaN" />

2. Build with XSG (MauiXamlInflator=SourceGen)

Expected Behavior

Generated code should use double.NaN:

button.Padding = new Thickness(double.NaN);

Actual Behavior

Generated code uses bare NaN:

button.Padding = new Thickness(NaN);

This results in:

error CS0103: The name 'NaN' does not exist in the current context

Affected File

src/Controls/samples/Controls.Sample/Pages/Controls/ButtonPage.xaml line 196

Workaround

Set the file to use Runtime inflator:

<MauiXaml Update="Pages/Controls/ButtonPage.xaml" Inflator="Runtime" />

[Ahamed-Ali]

This issue has been validated in Visual Studio Code 1.108.0 with MAUI versions 10.0.0 and 10.0.30. It is reproducible in all platforms