Escape :end: inside #+begin_example

Escape :end: inside #+begin_example

[Max Nikulin]

Hi,

is there a way to quote a drawer inside a literal example that resides 
in another drawer? Leading comma ",:end:", unlike for ",* Heading" or 
",#+end_src", is not stripped on export or C-c ' (`org-edit-special')

:drawer:
#+begin_src elisp
   ":src:
   %s
   :end:
   "
#+end_src
:end:

Re: Escape :end: inside #+begin_example

[Ihor Radchenko]

Max Nikulin <manikulin@gmail.com> writes:

> is there a way to quote a drawer inside a literal example that resides 
> in another drawer? Leading comma ",:end:", unlike for ",* Heading" or 
> ",#+end_src", is not stripped on export or C-c ' (`org-edit-special')
>
> :drawer:
> #+begin_src elisp
>    ":src:
>    %s
>    :end:
>    "
> #+end_src
> :end:

AFAIK, no. We should fix this.

From a quick glance, we need to update
`org-element--unescape-substring', `org-escape-code-in-region',
`org-escape-code-in-string', `org-unescape-code-in-region', and
`org-unescape-code-in-string'.
Also, the manual, and org-syntax document.

I see no obvious downside in additional escaping, except lesser blocks
with ,:... lines.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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