Override is_instantiable key for all Godot tweener classes

Author: Bromeon

godot-codegen/src/models/domain_mapping.rs

@@ -91,6 +91,8 @@ impl Class {
 
         // Already checked in is_class_deleted(), but code remains more maintainable if those are separate, and it's cheap to validate.
         let is_experimental = special_cases::is_class_experimental(&ty_name.godot_ty);
+        let is_instantiable =
+            special_cases::is_class_instantiable(&ty_name).unwrap_or(json.is_instantiable);
 
         let mod_name = ModName::from_godot(&ty_name.godot_ty);
 
@@ -129,7 +131,7 @@ impl Class {
                 mod_name,
             },
             is_refcounted: json.is_refcounted,
-            is_instantiable: json.is_instantiable,
+            is_instantiable,
             is_experimental,
             inherits: json.inherits.clone(),
             api_level: get_api_level(json),

godot-codegen/src/special_cases/special_cases.rs

@@ -206,6 +206,24 @@ pub fn is_class_experimental(godot_class_name: &str) -> bool {
     }
 }
 
+/// Whether a class can be instantiated (overrides Godot's defaults in some cases).
+///
+/// Returns `None` if the Godot default should be taken.
+pub fn is_class_instantiable(class_ty: &TyName) -> Option<bool> {
+    let class_name = class_ty.godot_ty.as_str();
+
+    // The default constructor is available but callers meet with the following Godot error:
+    // "ERROR: XY can't be created directly. Use create_tween() method."
+    // for the following classes XY:
+    //Tween, PropertyTweener, PropertyTweener, IntervalTweener, CallbackTweener, MethodTweener, SubtweenTweener,
+
+    if class_name == "Tween" || class_name.ends_with("Tweener") {
+        return Some(false);
+    }
+
+    None
+}
+
 /// Whether a method is available in the method table as a named accessor.
 #[rustfmt::skip]
 pub fn is_named_accessor_in_table(class_or_builtin_ty: &TyName, godot_method_name: &str) -> bool {