Add MustBeVariant attribute and analyzer

- MustBeVariant attribute can be used to enforce that generic types must
be a marshable from/to Variant.
- Also renames all diagnostic ids to be valid unicode identifiers.

1 files changed, 3 insertions, 0 deletions

diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
index bac4708165..d868678179 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs
@@ -177,6 +177,9 @@ namespace Godot.SourceGenerators
         public static bool IsGodotSignalAttribute(this INamedTypeSymbol symbol)
             => symbol.ToString() == GodotClasses.SignalAttr;
 
+        public static bool IsGodotMustBeVariantAttribute(this INamedTypeSymbol symbol)
+            => symbol.ToString() == GodotClasses.MustBeVariantAttr;
+
         public static bool IsGodotClassNameAttribute(this INamedTypeSymbol symbol)
             => symbol.ToString() == GodotClasses.GodotClassNameAttr;