ManoloFLTK left a comment (fltk/fltk#1597)

@MatthiasWM I think there's an error in function Fl_Widget::do_callback(). Its first statement

  if (!callback()) return;

should become

  if (!callback() && !callback_is_stdf()) return;

That's because the 2 member variables callback_ and stdf_callback_ are in an union but have distinct sizes, so that the second can be non-null while the first is null. I ommit all details here, but I had an error because of that when trying to replace the instances of FL_INLINE_CALLBACK_# in src/drivers/PostScript/Fl_PostScript.cxx by lambdas. The error occurred under macOS built with FLTK_BACKEND_X11=1 and not under Linux, but it occurred.

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