Eli Zaretskii <eliz@gnu.org> writes:

> Like I said, I don't think the behavior should be changed, only the
> documentation, which is somewhat misleading.  If we want some
> different behavior, we could have a new function, or a new value of
> the argument to indent-relative.
>
> Thanks.

What about changing `indent-relative-maybe' and adding an extra argument
to `indent-relative'? Since `indent-relative-maybe' has had that
docstring for a good 15 years, and the name fits the new behaviour more.

Then in Emacs core we can replace the single instance of it with
(indent-relative t). The corresponding diff: