I have never heard that dream expressed by Hungarians
It is impossible to talk about regional politics with Hungarians for 15 minutes without Trianon being brought up (sometimes multiple times).
While very few openly express hopes for overturning it they are obsessed with maintaining the language in the diaspora population (often more than the Hungarians in said places themselves).
They don't like the Ukrainian language law because they think Hungarians should be able to receive their entire education in Hungarian....
It's blindingly obvious that Orban siding with russia early on was at least partly motivated by maps about what countries would get what parts of Ukraine being circulated and part was to be given to Hungary.
I used to love visiting Hungary but really don't want to anymore unless they dump the useless russian puppet Orban