[fltk/fltk] Setting callback of Fl_Scroll's scrollbar freezes the scrollbar (#198) - Forums

Hello
I noticed that setting the callback for Fl_Scroll's scrollbar causes the scrollbar to freeze (even though the callback is triggered). A minimal reproducible example:

#include <FL/Fl_Window.H>
#include <FL/Fl_Scrollbar.H>
#include <FL/Fl_Scroll.H>
#include <FL/Fl_Box.H>
#include <FL/Fl.H>

void cb(Fl_Widget *, void *) {
    puts("works");
}

int main() {
    Fl_Window w(400, 300);
    Fl_Scroll s(50, 10, 340, 280);
    Fl_Box b(100, 500, 80, 40, "whatever");
    s.end();
    w.end();
    w.show();
    s.scrollbar.callback(cb, 0);
    return Fl::run();
}

While the behaviour with a regular Fl_Scrollbar just works:

int main() {
    Fl_Window w(400, 300);
    Fl_Scrollbar s(10, 10, 20, 280);
    w.end();
    w.show();
    s.callback(cb, 0);
    return Fl::run();
}

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