As far as I can tell you're right, there are no changes for 2020 for this area of tax law. The threshold amounts don't seem to be indexed in any way.
It is a common calculation that does happen to be taken care of by the tax prep software I use.
"At times the world can seem an unfriendly and sinister place, but believe us when we say there is much more good in it than bad. All you have to do is look hard enough, and what might seem to be a series of unfortunate events, may in fact be the first steps of a journey." Violet Baudelaire.