Hello

Consider the following program:

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Check_Button.H>

int main() {
  Fl::visible_focus(false);
  Fl_Window w(400, 300);
  Fl_Check_Button btn(160, 200, 80, 40, "Hello");
  w.end();
  w.show();
  return Fl::run();
}

Clicking on the check button several times causes the following artifact:

Removing the Fl::visible_focus(false) and just using btn.clear_visible_focus() doesn't produce the same issue.

Tested with version 1.4 built from source with CMake on both Windows 10 and Ubuntu 20.04 (WSL).

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