org-indent-mode
org-indent-mode is an interactive autoloaded Lisp function in `org-indent.el
'.
(org-indent-mode &optional ARG)
When active, indent text according to outline structure.
Internally this works by adding `line-prefix' and `wrap-prefix'
properties, after each buffer modification, on the modified zone.
The process is synchronous. Though, initial indentation of
buffer, which can take a few seconds on large buffers, is done
during idle time.