_ISPAD
flags |= _ISPAD;
bool is_padwin = (flags & _ISPAD);
win = NCURSES_SP_NAME(_nc_makenew) (NCURSES_SP_ARGx l, c, 0, 0, _ISPAD);
#define is_pad(win) (NCURSES_OK_ADDR(win) ? ((win)->_flags & _ISPAD) != 0 : FALSE)
#define IS_PAD(w) ((w)->_flags & _ISPAD)