fix CPI window handling:

Move control-surface editor-window management to the control surface.
The Preferences-Dialog is not aware of session specific or surface
specific actions and cannot properly manage the window.

gtk2_ardour/ardour_ui_dialogs.cc

@@ -25,8 +25,10 @@
 
 #include "ardour/audioengine.h"
 #include "ardour/automation_watch.h"
+#include "ardour/control_protocol_manager.h"
 #include "ardour/profile.h"
 #include "ardour/session.h"
+#include "control_protocol/control_protocol.h"
 
 #include "actions.h"
 #include "add_route_dialog.h"
@@ -262,6 +264,16 @@ ARDOUR_UI::unload_session (bool hide_stuff)
 		}
 	}
 
+	{
+		// tear down session specific CPI (owned by rc_config_editor which can remain)
+		ControlProtocolManager& m = ControlProtocolManager::instance ();
+		for (std::list<ControlProtocolInfo*>::iterator i = m.control_protocol_info.begin(); i != m.control_protocol_info.end(); ++i) {
+			if (*i && (*i)->protocol && (*i)->protocol->has_editor ()) {
+				(*i)->protocol->tear_down_gui ();
+			}
+		}
+	}
+
 	if (hide_stuff) {
 		editor->hide ();
 		mixer->hide ();

gtk2_ardour/rc_option_editor.cc

@@ -795,17 +795,7 @@ private:
 			if (!was_enabled) {
 				ControlProtocolManager::instance().activate (*cpi);
 			} else {
-				Gtk::Window* win = r[_model.editor];
-				if (win) {
-					win->hide ();
-				}
-
 				ControlProtocolManager::instance().deactivate (*cpi);
-					
-				if (win) {
-					delete win;
-					r[_model.editor] = 0;
-				}
 			}
 		}
 
@@ -828,26 +818,32 @@ private:
 		TreeModel::Row row;
 
 		row = *(_view.get_selection()->get_selected());
-
-		Window* win = row[_model.editor];
-		if (win && !win->is_visible()) {
-			win->present ();
-		} else {
+		if (!row[_model.enabled]) {
+			return;
+		}
 		cpi = row[_model.protocol_info];
-
-			if (cpi && cpi->protocol && cpi->protocol->has_editor ()) {
+		if (!cpi || !cpi->protocol || !cpi->protocol->has_editor ()) {
+			return;
+		}
 		Box* box = (Box*) cpi->protocol->get_gui ();
-				if (box) {
+		if (!box) {
+			return;
+		}
+		if (box->get_parent()) {
+			static_cast<ArdourWindow*>(box->get_parent())->present();
+			return;
+		}
 		string title = row[_model.name];
+		/* once created, the window is managed by the surface itself (as ->get_parent())
+		 * Surface's tear_down_gui() is called on session close, when de-activating
+		 * or re-initializing a surface.
+		 * tear_down_gui() hides an deletes the Window if it exists.
+		 */
 		ArdourWindow* win = new ArdourWindow (_parent, title);
 		win->set_title ("Control Protocol Options");
 		win->add (*box);
 		box->show ();
 		win->present ();
-					row[_model.editor] = win;
-				}
-			}
-		}
 	}
 
         class ControlSurfacesModelColumns : public TreeModelColumnRecord
@@ -860,14 +856,12 @@ private:
 			add (enabled);
 			add (feedback);
 			add (protocol_info);
-			add (editor);
 		}
 
 		TreeModelColumn<string> name;
 		TreeModelColumn<bool> enabled;
 		TreeModelColumn<bool> feedback;
 		TreeModelColumn<ControlProtocolInfo*> protocol_info;
-	        TreeModelColumn<Gtk::Window*> editor;
 	};
 
 	Glib::RefPtr<ListStore> _store;

libs/surfaces/generic_midi/gmcp_gui.cc

@@ -68,13 +68,22 @@ GenericMidiControlProtocol::get_gui () const
 	if (!gui) {
 		const_cast<GenericMidiControlProtocol*>(this)->build_gui ();
 	}
+	static_cast<Gtk::VBox*>(gui)->show_all();
 	return gui;
 }
 
 void
 GenericMidiControlProtocol::tear_down_gui ()
 {
+	if (gui) {
+		Gtk::Widget *w = static_cast<Gtk::VBox*>(gui)->get_parent();
+		if (w) {
+			w->hide();
+			delete w;
+		}
+	}
 	delete (GMCPGUI*) gui;
+	gui = 0;
 }
 
 void

libs/surfaces/mackie/gui.cc

@@ -51,14 +51,22 @@ MackieControlProtocol::get_gui () const
 	if (!_gui) {
 		const_cast<MackieControlProtocol*>(this)->build_gui ();
 	}
-
+	static_cast<Gtk::Notebook*>(_gui)->show_all();
 	return _gui;
 }
 
 void
 MackieControlProtocol::tear_down_gui ()
 {
+	if (_gui) {
+		Gtk::Widget *w = static_cast<Gtk::Widget*>(_gui)->get_parent();
+		if (w) {
+			w->hide();
+			delete w;
+		}
+	}
 	delete (MackieControlProtocolGUI*) _gui;
+	_gui = 0;
 }
 
 void