Is your feature request related to a problem? Please describe.
Given the following program:

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

const char *MSG = "Hello World";

int main() {
    auto w = new Fl_Window(400, 300);
    auto t = new Fl_Simple_Terminal(0, 0, 400, 300);
    t->append(MSG, 5);
    w->end();
    w->show();
    return Fl::run();
}

in FLTK 1.4, the signature of append implies that when passed a length, the length will be adhered to.
However this will print the whole message (until null termination). Which I would say is unintuitive and might be a source of issues.

I am using FLTK

• Version 1.4.0

Describe the solution you'd like
I would suggest that the append method adhere to the passed length in non-ansi mode.

Describe alternatives you've considered
The alternative would be to allocate new strings just to add null termination, which might be undesirable.

Additional context
N/A

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