ww_uflags
SET(w->ww_uflags, WWU_KEEPOPEN);
CLR(w->ww_uflags, WWU_KEEPOPEN);
if (!ISSET(wwcurwin->ww_uflags, WWU_KEEPOPEN))
SET(w->ww_uflags, WWU_HASFRAME | WWU_CENTER);
if (ISSET(w->ww_uflags, WWU_HASFRAME)) {
if (!ISSET(w->ww_uflags, WWU_HASFRAME))
if (ISSET(w->ww_uflags, WWU_CENTER)) {
CLR(w->ww_uflags, WWU_ALLFLAGS);
SET(w->ww_uflags, uflags);