- get_property ("middleCPosition"));
-
- if (to_boolean (get_property ("printKeyCancellation")))
- item_->set_property ("old-accidentals", get_property ("lastKeySignature"));
- item_->set_property ("new-accidentals", get_property ("keySignature"));
-
- announce_grob (item_, key_ev_ ? key_ev_->self_scm () : SCM_EOL);
+ get_property ("middleCClefPosition"));
+
+ SCM last = get_property ("lastKeySignature");
+ SCM key = get_property ("keySignature");
+
+ if ((to_boolean (get_property ("printKeyCancellation"))
+ || key == SCM_EOL)
+ && !scm_is_eq (last, key))
+ {
+ SCM restore = SCM_EOL;
+ for (SCM s = last; scm_is_pair (s); s = scm_cdr (s))
+ {
+ SCM new_alter_pair = scm_assoc (scm_caar (s), key);
+ Rational old_alter = robust_scm2rational (scm_cdar (s), 0);
+ if (new_alter_pair == SCM_BOOL_F
+ || ((ly_scm2rational (scm_cdr (new_alter_pair)) - old_alter) * old_alter
+ < Rational (0)))
+ {
+ restore = scm_cons (scm_car (s), restore);
+ }
+ }
+
+ if (scm_is_pair (restore))
+ {
+ cancellation_ = make_item ("KeyCancellation",
+ key_event_
+ ? key_event_->self_scm () : SCM_EOL);
+
+ cancellation_->set_property ("alteration-alist", restore);
+ cancellation_->set_property ("c0-position",
+ get_property ("middleCPosition"));
+ }
+ }
+
+ item_->set_property ("alteration-alist", scm_reverse (key));