From 0396a5cab7e3862643753d980ee03e02f099706d Mon Sep 17 00:00:00 2001
From: carlh <carlh@d708f5d6-7413-0410-9779-e7cbd77b26cf>
Date: Tue, 20 Jul 2010 23:25:02 +0000
Subject: [PATCH] Make AutomationLists clear their events when their state is
 set to an AutomationList with no Events node.  Fixes #3345.

git-svn-id: svn+ssh://ardour.org/ardour2/branches/3.0@7456 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/automation_list.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libs/ardour/automation_list.cc b/libs/ardour/automation_list.cc
index e7851043..17f346db 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;
 }
 
-- 
2.11.4.GIT