Minor fltk problem with "visible", "off"

[Michael D Godfrey]

Shai,

The sequence:

 plot([1:200])
fig=gcf()
set (fig, "visible", "off");

in gnuplot backend causes the figure
to disappear, and
set (fig, "visible", "on");
causes it to reappear.

In fltk the sequence seems to do nothing.

I only noticed this as I was studying the
"property already exists problem,"
which John seems to have fixed already.

Michael