>
> Might be worth trying with non-zero dimensions, just to see if that
> makes any different here...
>
> e.g. try; MyWin() : T(5,5,90,90) {}
>
Works fine.
A modified Fl_Double_Window.cxx works for me :
in void Fl_Double_Window::flush(int eraseoverlay) {
line 345-348 or near, I had a check on W() and H()
#if defined(USE_X11) || defined(WIN32)
myi->other_xid = ( w() && h() ? fl_create_offscreen(w(), h()) : 0 );
clear_damage(FL_DAMAGE_ALL);
#elif defined(__APPLE_QUARTZ__)
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