bug#46878: 27.1; lisp-outline-level returns imprecise level number

[Juri Linkov]

> Hopefully no reports a downside which is why I asked about any visible
> changes in what is shipped with emacs.

I tried to use your new definition, but noticed that
it adds a new cycling state: while using outline-cycle-buffer
previously it used to cycle between only two states
(thus it was convenient to collapse/expand all headings
with only one keypress S-TAB).

But with your change, it requires typing S-TAB twice
to get the state where all headings are shown and
their bodies are collapsed, because it cycles
between three states.