GRID_ATTR_STRIKETHROUGH
(attr & GRID_ATTR_STRIKETHROUGH) ? "strikethrough," : "",
{ "strikethrough", GRID_ATTR_STRIKETHROUGH },
{ GRID_ATTR_STRIKETHROUGH, 9 },
gc->attr |= GRID_ATTR_STRIKETHROUGH;
gc->attr &= ~GRID_ATTR_STRIKETHROUGH;
if (changed & GRID_ATTR_STRIKETHROUGH)