fixup! sequencer: ensure full index if not ORT strategy

Author: derrickstolee

sequencer.c

@@ -652,6 +652,7 @@ static int do_recursive_merge(struct repository *r,
 		merge_switch_to_result(&o, head_tree, &result, 1, show_output);
 		clean = result.clean;
 	} else {
+		ensure_full_index(r->index);
 		clean = merge_trees(&o, head_tree, next_tree, base_tree);
 		if (is_rebase_i(opts) && clean <= 0)
 			fputs(o.obuf.buf, stdout);