_session->StartTimeChanged.connect (_session_connections, invalidator (*this), boost::bind (&EditorSummary::set_background_dirty, this), gui_context());
_session->EndTimeChanged.connect (_session_connections, invalidator (*this), boost::bind (&EditorSummary::set_background_dirty, this), gui_context());
_editor->selection->RegionsChanged.connect (sigc::mem_fun(*this, &EditorSummary::set_background_dirty));
_session->StartTimeChanged.connect (_session_connections, invalidator (*this), boost::bind (&EditorSummary::set_background_dirty, this), gui_context());
_session->EndTimeChanged.connect (_session_connections, invalidator (*this), boost::bind (&EditorSummary::set_background_dirty, this), gui_context());
_editor->selection->RegionsChanged.connect (sigc::mem_fun(*this, &EditorSummary::set_background_dirty));