void center_screen (framepos_t);
TrackViewList axis_views_from_routes (boost::shared_ptr<ARDOUR::RouteList>) const;
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Gtkmm2ext::TearOff* mouse_mode_tearoff () const { return _mouse_mode_tearoff; }
Gtkmm2ext::TearOff* tools_tearoff () const { return _tools_tearoff; }