modifier keys (Re: Two bugs in the Dillo GUI (both Mac and ubuntu))

I wrote:
> By the way, the only mention of FL_META in Fl_x.cxx is
> 
> #  ifdef __sgi
>   // get the meta key off PC keyboards:
>   if (fl_key_vector[18]&0x18) Fl::e_state |= FL_META;
> #  endif
> 
> I'd assumed that, for FLTK under X, Meta was a synonym for Alt,
> or maybe the windows keys or something (which I don't have).

Can anyone with windows keys verify that they don't set FL_META?
There _is_ code for:

    // For the first few years, there wasn't a good consensus on what the
    // Windows keys should be mapped to for X11. So we need to help out a
    // bit and map all variants to the same FLTK key...
    switch (keysym) {
        case XK_Meta_L:
        case XK_Hyper_L:
        case XK_Super_L:
          keysym = FL_Meta_L;
          break;
        case XK_Meta_R:
        case XK_Hyper_R:
        case XK_Super_R:
          keysym = FL_Meta_R;
          break;
      }

and maybe there's something going on somewhere that I haven't noticed.
I ask because perhaps we'll want to open an STR to get FL_META set.