+ act = ActionManager::register_action (editor_actions, "expand-tracks", _("Expand Track Height"), sigc::bind (sigc::mem_fun (*this, &Editor::tav_zoom_step), false));
+ ActionManager::session_sensitive_actions.push_back (act);
+ act = ActionManager::register_action (editor_actions, "shrink-tracks", _("Shrink Track Height"), sigc::bind (sigc::mem_fun (*this, &Editor::tav_zoom_step), true));
+ ActionManager::session_sensitive_actions.push_back (act);
+