In any market, it is not uncommon for buyers and sellers to spar over light fixtures, window treatments and appliances, with million-dollar deals sometimes unraveling over items that cost a few thousand. Generally, anything affixed to the walls — cabinets, sinks and toilets — is considered part of the sale, with removable items like light fixtures and mounted flat-screen televisions falling into a gray area that gets hammered out during contract negotiations. If an item goes, it is usually replaced with a contractor-grade equivalent. But ultimately, a contract can include whatever terms a buyer and seller agree to.And this year, buyers …