redesign toggling of editor/mixer stacking to use Gtkmm2ext::VisibilityTracker

1 files changed, 3 insertions, 1 deletions

diff --git a/gtk2_ardour/mixer_ui.h b/gtk2_ardour/mixer_ui.h
index 2946d0ae59..8a293f7f9f 100644
--- a/gtk2_ardour/mixer_ui.h
+++ b/gtk2_ardour/mixer_ui.h
@@ -40,6 +40,8 @@
 #include "ardour/types.h"
 #include "ardour/session_handle.h"
 
+#include "gtkmm2ext/visibility_tracker.h"
+
 #include "enums.h"
 #include "mixer_actor.h"
 
@@ -53,7 +55,7 @@ class PluginSelector;
 class MixerGroupTabs;
 class MonitorSection;
 
-class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr, public MixerActor
+class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr, public MixerActor, public Gtkmm2ext::VisibilityTracker
 {
   public:
 	static Mixer_UI* instance();