GRID_ATTR_HIDDEN
(attr & GRID_ATTR_HIDDEN) ? "hidden," : "",
{ "hidden", GRID_ATTR_HIDDEN },
{ GRID_ATTR_HIDDEN, 8 },
gc->attr |= GRID_ATTR_HIDDEN;
gc->attr &= ~GRID_ATTR_HIDDEN;
if (changed & GRID_ATTR_HIDDEN)