Bastien <bzg@gnu.org> writes:

> I see something wrong right now: RET after a headline should only try
> to indent below the beginning of the headline with org-adapt-indentation 
> is t, but not nil or headline-data.
>
> For now, when org-adapt-indentation is headline-data, RET still indents.
>
> I will see how to fix this.
>
> Also, I'm thinking of using headline-data as the new default for the
> org-adapt-indentation option.  WDYT?

I personally agree that headline-data makes more sense as a default
given the feedback we received a few weeks ago; as you noticed though
there might be a few loose ends to tie up before making the switch:

- As you said, RET after a headline indents, but the common case for
  hitting RET after a headline is probably to write text, since IME
  headline drawers are always inserted with dedicated commands; thus RET
  should not indent after a header.

- RET after a headline drawer's :END: also indents.

- RET in a list item does not indent; it's not obvious that it should,
  but FWIW (1) RET indents when org-adapt-indentation is t (2) that
  would be my preference.

Also, Greg Minshall (CC'ed) helpfully laid out how org-adapt-indentation
and electric-indent-mode play together in one neat table:

https://orgmode.org/list/2020-11-13T18-23-43@devnull.Karl-Voit.at/t/#mec37faab85f3de59e25a7c1640e5f50be5494192

I didn't take the time to properly review his findings, but there might
be more inconsistencies lurking in there.

Finally, not a big problem if headline-data becomes the default, but:
the :safe predicate is still booleanp.  Patch attached: