Hi,

Thanks for you reply. I cannot understand the design of
`org-src-preserve-indentation`.

Setting it to `nil` cause what described in my previous mail.
Setting it to `t` lose the leading two spaces indentation/alignment in the
origin org buffer.

If it is `nil`, why inserting 2 leading spaces to the code in the org
buffer except the line containing only spaces?

How can I get

#+BEGIN_SRC python
    a = 1
    b = 2
    for i in range(10):
        # 6 spaces before '#'
#+END_SRC

after exit `org-edit-special` ?

Best regards,
Jiajian Huang

On Sat, Jan 7, 2017 at 12:31 AM, Nicolas Goaziou <mail@nicolasgoaziou.fr>
wrote:

> Hello,
>
> Jiajian Huang <ispinfx@gmail.com> writes:
>
> > Reproduce steps:
> >
> > Launch emacs by `emacs -Q`, eval the following snippet(assumed org 9.x
> > is installed via elpa)
> >
> >     (package-initialize)
> >     (require 'org)
> >
> > open a org buffer, input the source by <s and type `python`
> >
> > #+BEGIN_SRC python
> >
> > #+END_SRC
> >
> > use C-c ' to edit the block and input
> >
> >     for i in range(10):      # input this line and <enter>
> >         # there are 4 spaces before the '#' now
> >
> > use C-c ' to close the source block buffer and back to org-mode, we can
> > see the first line of the block is indented 2 spaces by org while the
> blank
> > line
> > isn't.
>
> This is not a bug. See `org-src-preserve-indentation'.
>
> Regards,
>
> --
> Nicolas Goaziou
>