Context:
Manually compiled Emacs 24.4.1 on Debian Wheezy(+updates) x86_64.
ECM:
1. emacs -Q
2. Split frame into two windows via `C-x 3`.
3. Make one "*scratch*" buffer window dedicated via:
(a) `M-:`
(b) (set-window-dedicated-p (selected-window) t)
4. Select the other window.
5. Visit file `test.org`, containing:
* Test
#+begin_src emacs-lisp
(message "Test.")
#+end_src
6. Move point within source block, do `org-edit-special`.
7. The "*scratch*" buffer window will have its contents changed to
contain an Org buffer.
Alexis.