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

[Gregory Heytings]

> Reproduction:
>
> 1. emacs -Q
> 2. type M-x global-text-scale-adjust RET
> 4. type -

Is there a 3. missing in your recipe?

> Expected:
>
> font size decreases
>
> Actual:
>
> nothing happens

Really nothing?  Do you see something in the echo area?  What happens if 
you press + instead?  Also, can you try again after M-x 
toggle-debug-on-error RET?