bug#50894: [External] : bug#50894: Disable show-paren-mode in special modes

[Drew Adams]

> >> Sounds good to me, but are there any special-modes where it is
> useful?
> >>
> >> Perhaps we can just disable it in `special-mode', and if we think of
> >> some modes where it seems really useful, we re-enable it for them?
> >
> > I can't think of any special modes where it's useful, so I think that
> > sounds like a plan.
> 
> So here is a new request created from bug#50881.

So does this mean that if someone has previously
turned on `show-paren-mode' (globally) s?he now has
to explicitly turn it on in `special-mode'?

If so, why impose that backward-incompatible change?