Slightly grubby hack to fix up the state of the Window->Mixer menu item when the mixer is opened on starting Ardour (#4808).

git-svn-id: svn://localhost/ardour2/branches/3.0@12599 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/mixer_ui.cc

@@ -593,6 +593,12 @@ Mixer_UI::set_session (Session* sess)
 
 	if (_visible) {
 		show_window();
+
+		/* Bit of a hack; if we're here, we're opening the mixer because of our
+		   instant XML state having a show-mixer property.  Fix up the corresponding
+		   action state.
+		*/
+		ActionManager::check_toggleaction ("<Actions>/Common/toggle-mixer");
 	}
 
 	start_updating ();

libs/gtkmm2ext/actions.cc

@@ -344,8 +344,20 @@ ActionManager::set_sensitive (vector<RefPtr<Action> >& actions, bool state)
 	}
 }
 
+void
+ActionManager::check_toggleaction (string n)
+{
+	set_toggleaction_state (n, true);
+}
+
 void
 ActionManager::uncheck_toggleaction (string n)
+{
+	set_toggleaction_state (n, false);
+}
+
+void
+ActionManager::set_toggleaction_state (string n, bool s)
 {
 	char const * name = n.c_str ();
 	
@@ -369,7 +381,7 @@ ActionManager::uncheck_toggleaction (string n)
         RefPtr<Action> act = get_action (group_name, action_name);
 	if (act) {
 	        RefPtr<ToggleAction> tact = RefPtr<ToggleAction>::cast_dynamic(act);
-       		tact->set_active (false);
+       		tact->set_active (s);
 	} else {
 		error << string_compose (_("Unknown action name: %1"),  name) << endmsg;
 	}

libs/gtkmm2ext/gtkmm2ext/actions.h

@@ -86,7 +86,9 @@ namespace ActionManager {
 				     std::vector<std::string>& tooltips,
 				     std::vector<Gtk::AccelKey>& bindings);
 
+	extern void check_toggleaction (std::string);
 	extern void uncheck_toggleaction (std::string);
+	extern void set_toggleaction_state (std::string, bool);
 };
 
 #endif /* __libgtkmm2ext_actions_h__ */