Fix get_all_delegates method for generic classes

If the class is generic, we must get its generic type definition and use
it to retrieve the delegates.

1 files changed, 12 insertions, 0 deletions

diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/MarshalUtils.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/MarshalUtils.cs
index 3051bcedc7..ee4d0eed08 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/MarshalUtils.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/MarshalUtils.cs
@@ -80,6 +80,18 @@ namespace Godot
         private static bool TypeIsGenericIDictionary(Type type) => type.GetGenericTypeDefinition() == typeof(IDictionary<,>);
 
         /// <summary>
+        /// Returns the generic type definition of <paramref name="type"/>.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown when the given <paramref name="type"/> is not a generic type.
+        /// That is, <see cref="Type.IsGenericType"/> returns <see langword="false"/>.
+        /// </exception>
+        private static void GetGenericTypeDefinition(Type type, out Type genericTypeDefinition)
+        {
+            genericTypeDefinition = type.GetGenericTypeDefinition();
+        }
+
+        /// <summary>
         /// Gets the element type for the given <paramref name="arrayType"/>.
         /// </summary>
         /// <param name="arrayType">Type for the generic array.</param>