- set_nested_property (current_spanner_,
- scm_list_3 (ly_symbol2scm ("bound-details"),
- ly_symbol2scm ("left"),
- ly_symbol2scm ("attach-dir")
- ),
- scm_from_int (RIGHT));
+
+ if (!Hairpin::has_interface (current_spanner_))
+ set_nested_property (current_spanner_,
+ scm_list_3 (ly_symbol2scm ("bound-details"),
+ ly_symbol2scm ("left"),
+ ly_symbol2scm ("attach-dir")
+ ),
+ scm_from_int (RIGHT));