WA_HORIZONTAL
WA_HORIZONTAL,
attr |= WA_HORIZONTAL;
if (attr & WA_HORIZONTAL && t_enter_horizontal_hl_mode(t) != NULL)
win->wattr |= WA_HORIZONTAL;
if (attr & WA_HORIZONTAL)
win->wattr &= ~WA_HORIZONTAL;
| WA_TOP | WA_LOW | WA_LEFT | WA_RIGHT | WA_HORIZONTAL | WA_VERTICAL)
if (on & WA_HORIZONTAL && enter_horizontal_hl_mode != NULL)
curscr->wattr |= WA_HORIZONTAL;