fix: Fix focus range being discarded in attributes/derives when upmapping

crates/hir-expand/src/lib.rs

@@ -220,6 +220,8 @@ pub enum MacroCallKind {
     },
     Attr {
         ast_id: AstId<ast::Item>,
+        // FIXME: This is being interned, subtrees can very quickly differ just slightly causing
+        // leakage problems here
         attr_args: Option<Arc<tt::Subtree>>,
         /// Syntactical index of the invoking `#[attribute]`.
         ///