[.NET] Interpolated strings as exported member's default value break source generation

[paulloz]

Tested versions

• Reproducible in: 4.3.dev [df78c06], 4.2.stable

System information

Windows 10

Issue description

Using an interpolated string as the default value for an exported field or property can lead to ScriptPropertyDefValGenerator producing invalid C# code. The generator fully qualifying identifiers within the interpolated string, leading to the following error during compilation. This is due to the use of global:: within the interpolation string. Identifiers would need to be enclosed ().

CS0103: The name 'global' does not exist in the current context ..._ScriptPropertyDefVal.generated.cs(...)

Steps to reproduce

• Input script

public partial class Foo : Node
{
    [Export]
    public string EngineVersion = $"{Godot.Engine.GetVersionInfo()}";
}

• Actual (-) vs. expected (+)

partial class Foo
{
#pragma warning disable CS0109 // Disable warning about redundant 'new' keyword
#if TOOLS
    /// <summary>
    /// Get the default values for all properties declared in this class.
    /// This method is used by Godot to determine the value that will be
    /// used by the inspector when resetting properties.
    /// Do not call this method.
    /// </summary>
    [global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
    internal new static global::System.Collections.Generic.Dictionary<global::Godot.StringName, global::Godot.Variant> GetGodotPropertyDefaultValues()
    {
        var values = new global::System.Collections.Generic.Dictionary<global::Godot.StringName, global::Godot.Variant>(1);
-        string __EngineVersion_default_value = $"{global::Godot.Engine.GetVersionInfo()}";
+        string __EngineVersion_default_value = $"{(global::Godot.Engine.GetVersionInfo())}";
        values.Add(PropertyName.EngineVersion, global::Godot.Variant.From<string>(__EngineVersion_default_value));
        return values;
    }
#endif // TOOLS
#pragma warning restore CS0109
}

Minimal reproduction project (MRP)

N/A