I just want to disable drawing the dotted rectangle inside some widgets for better appearence (eg. browser item, tree item) while keeping keyboard navigation.

But as the document says:

If visible focus is switched on, FLTK will draw a dotted rectangle inside the
widget that will receive the next keystroke. If switched off, no such indicator
will be drawn and keyboard navigation is disabled.

Both Fl::focus(Fl_Widget*) and Fl_Widget::visible_focus() will disable the keybord navigation.

After investigating the codes of fltk-1.4.x-20230512-7a50c823, I havn't found any way just preventing draw dotted rectangle.

In my option, it would be better if there were two methods:

1. Fl::visible_foucs() for drawing dotted rectagle or not.
2. Fl::enable_foucs() for keybord navigation or not. Ofcause, if dissabled, dotted rectangel neither drawn.

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