[feature] Consistent fixed indentation of headline data

[Valentin Lab]

Hi everybody,

I'm using org-mode for a long time, and I never understood quite well 
how headline data were supposed to be indented, however I was happy with 
what emerged to me as the default of 2 spaces (with my emacs and 
org-mode version at the time). I recently updated my old emacs to 
=9.5.3=, and what I thought was a default indentation was removed.

Suddenly, I had no indentation at all for these headline-data and this 
bugged me.

I went through documentation, and code, and (re-)discovered 
`org-adapt-indentation' that was nil in my case and is intended to stay 
this way as far as I am concerned : I'm looking for a fixed indentation 
whatever the depth of my outlines.

I'm far from sure it was a default one day, but sure it was at least 
suggested/enforced in my workflow with my emacs at some time. And even 
if it didn't feel like it was clad in iron, it seems I'm not the only 
one who was using that as I can find some examples remaining in the 
current 'testing/examples' org files.

This indentation concerns only what is called "headline data" in the 
documentation of `org-adapt-indentation'. To be precise: schedules 
("SCHEDULE:", "DEADLINE:"...), clock drawer (":LOGBOOK:..."), property 
drawer (":PROPERTY:..."). These are "data" appearing after the headline 
as I understand them.

If I'm a user of org-mode, I'm fairly new in the emacs lisp and hacking 
community and I need to know:
- if my proposal is useful and has any chance to be accepted,
- if there are any pitfalls I delved into in matter of coding, 
conventions, ...
- if it make sense for others to include this,

Many thanks !

0001-org-el-Add-fixed-indentation-of-headline-data.patch
Description: Text Data