[O] Indentation of backend definitioon

[Carsten Dominik]

Hi Nicolas,

I propose the following patch to improve the automatic
indentation of the backend definition macros in ox.el.

- Carsten

diff --git a/lisp/ox.el b/lisp/ox.el
index c5b6d7c..31983b2 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -987,6 +987,7 @@ keywords are understood:
            ',export-block))
        ;; Splice in the body, if any.
        ,@body)))
+(put 'org-export-define-backend 'lisp-indent-function 1)
 
 (defmacro org-export-define-derived-backend (child parent &rest body)
   "Create a new back-end as a variant of an existing one.
@@ -1078,6 +1079,7 @@ The back-end could then be called with, for example:
            ',export-block))
        ;; Splice in the body, if any.
        ,@body)))
+(put 'org-export-define-derived-backend 'lisp-indent-function 2)
 
 (defun org-export-backend-parent (backend)
   "Return back-end from which BACKEND is derived, or nil."
@@ -5201,6 +5203,7 @@ and
                           (message "Process '%s' exited abnormally" p))
                       (unless org-export-async-debug
                         (delete-file ,,temp-file)))))))))))))
+(put 'org-export-async-start 'lisp-indent-function 1)
 
 (defun org-export-add-to-stack (source backend &optional process)
   "Add a new result to export stack if not present already.