I opened issue #435 on GitHub with an example program, which I reproduce here as it is small.  Compile with fltk-config.

#include <FL/Fl.H>
#include <FL/Enumerations.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Menu_Button.H>

void empty_cb( Fl_Widget* w, void* )
{
}

int main(int argc, char** argv)
{
    Fl::scheme( "gtk+" );  // base is fine, plastic is also wrong
    Fl::set_color( FL_BACKGROUND_COLOR, 64, 64, 64 );

    Fl_Double_Window *window = new Fl_Double_Window(400,400,"Use RMB for menu");
    Fl_Menu_Button* m = new Fl_Menu_Button(0,0,400,400);
    m->type( Fl_Menu_Button::POPUP3 );

    m->add( "See/White corners in menus", 0, (Fl_Callback*)empty_cb, NULL );

    window->end();
    window->show();

    return Fl::run();
}


—
Gonzalo Garramuno
ggarra13@gmail.com




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