I doubt they will favor Trump favorable?
How many Liberals say positive things about Reagan?
They still think he killed a million gay people.
I have certainly heard liberals say positive things about Reagan, particularly in comparison to Trump today or to G.W. Bush when he was President. Here are a couple random examples I found through a brief Google search just now: Eric Terzuolo (The Hill):Donald Trump is No Ronald Reagan. Alexei Bayer (Salon and The Globalist): Reagan vs. Trump: Two entertainer-politicians compared. Gilroy Dispatch (2004 editorial): Comparing Reagan and George W. Bush.
Also, in recent years, liberals have been fond of pointing to Reagan's support for an "assault weapons" ban.
Also, we have already had a preview of how they will rehabilitate Trump’s image during the next Republican administration: just look at all the articles and comments about how a President Pence would be “even worse” because of his social conservatism.
Once it is convenient to do so, liberals will suddenly discover the obvious fact that Trump is not a conservative ideologue, and they will contrast his centrism with the “right wing extremism” of whatever Republican happens to be President.