if (acc && to_boolean (ly_assoc_get (ly_symbol2scm ("end-on-accidental"), details, SCM_BOOL_F)))
x_coord = robust_relative_extent (acc, commonx, X_AXIS).linear_combination (attach);
if (acc && to_boolean (ly_assoc_get (ly_symbol2scm ("end-on-accidental"), details, SCM_BOOL_F)))
x_coord = robust_relative_extent (acc, commonx, X_AXIS).linear_combination (attach);