Make AutomationLists clear their events when their state is set to an AutomationList with no Events node. Fixes #3345.

git-svn-id: svn://localhost/ardour2/branches/3.0@7456 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 13 insertions, 0 deletions

diff --git a/libs/ardour/automation_list.cc b/libs/ardour/automation_list.cc
index e785104367..17f346db1d 100644
--- a/libs/ardour/automation_list.cc
+++ b/libs/ardour/automation_list.cc
@@ -448,12 +448,25 @@ AutomationList::set_state (const XMLNode& node, int version)
 		_max_xval = 0; // means "no limit ;
 	}
 
+	bool have_events = false;
+	
 	for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
 		if ((*niter)->name() == X_("events")) {
 			deserialize_events (*(*niter));
+			have_events = true;
 		}
 	}
 
+	if (!have_events) {
+		/* there was no Events child node; clear any current events */
+		freeze ();
+		clear ();
+		mark_dirty ();
+		reposition_for_rt_add (0);
+		maybe_signal_changed ();
+		thaw ();
+	}
+
 	return 0;
 }