bug#21634: text-scale-adjust suggestion

[Juri Linkov]

>> Indeed, text-scale-adjust could be trivially modified to use
>> repeat-map that supports repeat-exit-timeout.  But the problem is
>> that this feature is available only when repeat-mode is enabled.
>> Maybe not a problem to enable it when the user wants repeatable keys.
>
> I think implementing text-scale-adjust on top of repeat-mode would be
> good -- and it could just enable repeat-mode for itself temporarily, I
> think?

Maybe a new mode transient-repeat-mode could be created.
Then text-scale-adjust could temporarily activate
this mode instead of using set-transient-map.