> Anyway, your initiative got my attention.  Do you remember what I
> wrote previously?
>
>> [jt] I would even go as far as obsoleting the variable entirely, and
>> use make-obsolete-variable instead: there's no real reason
>> why newline should be given special treatment.  And users
>> that need this for some obscure reason can probably plug it
>> in post-self-insert-hook.
>
>> If you obsolete the variable, you can remove it from the
>> manual, too.
>
> I still think this is the best option, so if you didn't already push that,
> I would be thankful that you do. It should solve your issue and make
> the code and manual simpler.

I had doubts about removing it, but since you are sure about this,
then please see the following patch attached.  If basically this is ok,
I'll also change the manual, NEWS, etc.

> And maybe consider opening different bugs for the other issues?

I'll try to keep one report per bug.
So I opened a separate bug#35592 for Martin
with a complete scenario to reproduce another bug.