Since insert preceedes deletes, follow that ordering in Transaction::changes.

Produces the same output but will take the happy path.

helix-core/src/transaction.rs

@@ -477,8 +477,8 @@ pub fn change<I>(state: &State, changes: I) -> Self
             let span = to - from;
             match tendril {
                 Some(text) => {
-                    changeset.delete(span);
                     changeset.insert(text);
+                    changeset.delete(span);
                 }
                 None => changeset.delete(span),
             }