bug#64535: 30.0.50; Spurious newlines in `prin1` output

[Stefan Monnier]

>> Can we get rid of this quirk now, please?
>
> I'm okay with getting rid of it, with two conditions:
>
>   . removing newline insertion in the scenario of bug#2866 leaves
>     Emacs sufficiently performant, even in the unoptimized build, and
>   . we will still insert a newline if long-line-threshold is nil

That means we'd keep the code and make it even larger.

> IOW, I don't want us to bring back regressions as result of
> this cleanup.

That wouldn't be a cleanup, then.  IOW you're asking me to make the
quirk even bigger.  I'd rather keep the quirk as-is, in that case.

Thanks, closing,


        Stefan