int edit_w = EditPanel::calculate_w(mwindow, 1, total_buttons);
int transport_w = PlayTransport::get_transport_width(mwindow) + toggle_margin;
int zoom_w = ZoomPanel::calculate_w(czoom_w);
int edit_w = EditPanel::calculate_w(mwindow, 1, total_buttons);
int transport_w = PlayTransport::get_transport_width(mwindow) + toggle_margin;
int zoom_w = ZoomPanel::calculate_w(czoom_w);