bug#59122: 29.0.50; global-text-scale-adjust not working

[Eli Zaretskii]

> Cc: 59122@debbugs.gnu.org, Rudolf Adamkovič <salutis@me.com>
> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Sun, 13 Nov 2022 05:48:26 -0800
> 
> Gregory Heytings <gregory@heytings.org> writes:
> 
> > Thanks.  This bug is fixed in the attached patch.
> 
> I can verify that the bug is fixed in that patch.  Thanks.
> 
> > It should of course be possible to make text-scale-adjust scale
> > smoothly too.
> 
> I think that would be good, to make things more consistent.  Even better
> if we could customize the step size, and/or the method of scaling for
> both commands.  One defcustom could be shared by both.

The change in text-scale-adjust should be backward-compatible by
default, otherwise I'll object to it.