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

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> > Because text-scale-adjust is cruder: it uses a factor instead of an
> > increment.  The effect of global-text-scale-adjust is much smoother.
>
> This subtle difference should probably be in the doc string, as users
> will normally assume that global-text-scale-adjust is just a
> globalized version of text-scale-adjust.

Is 'global-text-scale-adjust' new in Emacs 29?  Maybe it would be
better if they both work the same, presumably the same way as
'text-scale-adjust' does now (or the other way, if that's better).
Then we could introduce a new defcustom to make them both behave the
other way.  Would that make sense?