bug#41852: 27.0.50; text-scale commands don't scale header of tabulated-list-mode

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Tue, 20 Oct 2020 14:40:17 +0000
> Cc: thomas.hisch@ims.co.at, 41852@debbugs.gnu.org
> 
> >> Do you mean something like this?
> >
> > Yes.  Except that now I'm asking whether we need to obsolete the
> > variable.  is that just because of the name?
> 
> I guess we could re-use the old name if we really want to.  But it would
> still be a breaking change, since this is now a list instead of a single
> value.

That's also easy to handle in a compatible way, right?