==> Fl::flush() in Fl.cxx 437
==> Fl_Window::flush() in Fl.cxx 1149
1. Fl_Window::draw() in Fl_Window.cxx 101
2. Fl_Group::draw() in Fl_Group.cxx 550
3. Fl_Group::draw_children() in Fl_Group.cxx 537

redraw the entire thing
4. Fl_Group::draw_child()
5. Fl_Group::widget.draw()

only redraw the children that need it
4. Fl_Group::update_child()
5. Fl_Group::widget.draw()


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