[O] Bug: Archiving creates multiple parent tasks in master [9.1.13 (release_9.1.13-787-g13a09b @ c:/D-Drive/bin/org-mode/lisp/)]

[Bernt Hansen]

Hi,

Archiving tasks using the master branch with the below configuration
creates duplicate "* Archived Tasks" heading each time you archive in
the test.org_archive file.

The behaviour in the maint branch is correct and files subsequently
archived tasks under the single main heading.

Thanks for org-mode!

Regards,
Bernt

-- test.el -------------------------------------------------------------
(setq org-archive-location "%s_archive::* Archived Tasks")

-- test.org ------------------------------------------------------------
#+FILETAGS: TEST
#+STARTUP: content

*Keys To Reproduce*

1) Move to next heading
   C-c C-n

2) Move to next heading
   C-c C-n

3) Archive heading
   C-c C-x C-a

4) Archive heading
   C-c C-x C-a

Results in test.org_archive:

maint branch produces (correct)
#+BEGIN_EXAMPLE
* Archived Tasks
** TODO do something
** TODO foo                                                             :BAR:
#+END_EXAMPLE

master branch produces (incorrect)
#+BEGIN_EXAMPLE
* Archived Tasks
** TODO do something
* Archived Tasks
** TODO foo                                                             :BAR:
#+END_EXAMPLE

* TODO Test Parent                                          :PRODUCTION:MISC:
  :PROPERTIES:
  :EFFORT:   15:30
  :END:
** TODO do something
   :PROPERTIES:
   :EFFORT:   15
   :END:
   :LOGBOOK:
   CLOCK: [2018-05-12 Sat 00:26]--[2018-05-12 Sat 00:26] =>  0:00
   CLOCK: [2018-05-12 Sat 00:23]--[2018-05-12 Sat 00:23] =>  0:00
   CLOCK: [2018-05-12 Sat 00:22]--[2018-05-12 Sat 00:22] =>  0:00
   CLOCK: [2018-05-12 Sat 00:22]--[2018-05-12 Sat 00:22] =>  0:00
   CLOCK: [2018-05-12 Sat 00:07]--[2018-05-12 Sat 00:08] =>  0:01
   CLOCK: [2018-05-12 Sat 00:00]--[2018-05-12 Sat 00:04] =>  0:04
   :END:
** TODO foo                                                             :BAR:
   :PROPERTIES:
   :EFFORT:   00:30
   :END:


------------------------------------------------------------------------

Emacs  : GNU Emacs 23.2.1 (i486-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2013-01-08 on murphy, modified by Debian
Package: Org-mode version 8.3.1 (release_8.3.1-54-g102def @ 
/home/bernt/git/org-mode/lisp/)