fix: extract_struct_from_enum_variant should resolve Self generic arg

Author: Young-Flash

crates/ide-assists/src/handlers/extract_struct_from_enum_variant.rs

@@ -246,6 +246,32 @@ fn create_struct_def(
         Either::Left(field_list) => {
             let field_list = field_list.clone_for_update();
 
+            // replace `Self` with the enum name when construct struct def
+            field_list
+                .fields()
+                .filter_map(|field| match field.ty()? {
+                    ast::Type::PathType(p) => {
+                        let generic_arg_list = p.path()?.segment()?.generic_arg_list()?;
+                        Some(
+                            generic_arg_list
+                                .generic_args()
+                                .filter_map(|generic_arg| {
+                                    if generic_arg.to_string() == "Self" {
+                                        let type_arg =
+                                            make::type_arg(make::ty(&enum_.name()?.to_string()))
+                                                .clone_for_update();
+                                        Some(ted::replace(generic_arg.syntax(), type_arg.syntax()))
+                                    } else {
+                                        None
+                                    }
+                                })
+                                .count(),
+                        )
+                    }
+                    _ => None,
+                })
+                .count();
+
             if let Some(vis) = &enum_vis {
                 field_list
                     .fields()