Mark Sequence as edited when one of its parent ControlSet's ControlLists is changed.

git-svn-id: svn://localhost/ardour2/branches/3.0@7404 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/evoral/src/ControlSet.cpp

@@ -41,6 +41,8 @@ void
 ControlSet::add_control(boost::shared_ptr<Control> ac)
 {
 	_controls[ac->parameter()] = ac;
+
+	ac->ListMarkedDirty.connect_same_thread (_control_connections, boost::bind (&ControlSet::control_list_marked_dirty, this));
 }
 
 void
@@ -108,6 +110,8 @@ ControlSet::clear_controls ()
 {
 	Glib::Mutex::Lock lm (_control_lock);
 
+	_control_connections.drop_connections ();
+
 	for (Controls::iterator li = _controls.begin(); li != _controls.end(); ++li)
 		li->second->list()->clear();
 }