Bug: org-agenda-skip-deadline-prewarning-if-scheduled as pre-scheduled has no effect [9.0.5 (9.0.5-elpaplus @ /home/jorge/.emacs.d/elpa/org-plus-contrib-20170210/)]

[Jorge Morais Neto <jorge13515@gmail.com>]

1. Write a file named agenda_bug.org with the following content
(remove indentation):
      *** TODO Dummy
      SCHEDULED: <2017-03-06 Seg> DEADLINE: <2017-03-07 Ter ++1m -6d>

2. Start GNU Emacs 25.2.1 (25.2-rc2) with an empty init.el.
3. (require 'org-agenda)
4. Customize org-agenda-skip-deadline-prewarning-if-scheduled to
   'pre-scheduled
5. Visit agenda_bug.org and type C-c [
6. M-x org-agenda a <RET>
7. The warning of deadline "Dummy" appears under today.  According to the
   docstring of org-agenda-skip-deadline-prewarning-if-scheduled, it should
   not appear before the scheduled date.

Regards

Emacs  : GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2017-02-22
Package: Org mode version 9.0.5 (9.0.5-elpaplus @
/home/jorge/.emacs.d/elpa/org-plus-contrib-20170210/)

current state:
==============
(setq
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
 org-agenda-skip-deadline-prewarning-if-scheduled 'pre-scheduled
 org-speed-command-hook '(org-speed-command-default-hook
org-babel-speed-command-hook)
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-shell-link-function 'yes-or-no-p
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-babel-pre-tangle-hook '(save-buffer)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207"
  [add-hook change-major-mode-hook org-show-block-all append local] 5]
#[0 "\300\301\302\303\304$\207"
  [add-hook change-major-mode-hook org-babel-show-result-all append local] 5]
org-babel-result-hide-spec org-babel-hide-all-hashes org-eldoc-load)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
 org-cycle-show-empty-lines org-optimize-window-after-visibility-change)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-link-parameters '(("id" :follow org-id-open)
      ("rmail" :follow org-rmail-open :store org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link)
      ("irc" :follow org-irc-visit :store org-irc-store-link)
      ("info" :follow org-info-open :export org-info-export :store
org-info-store-link)
      ("gnus" :follow org-gnus-open :store org-gnus-store-link)
      ("docview" :follow org-docview-open :export org-docview-export :store
org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete
org-bbdb-complete-link :store org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link) ("file+sys") ("file+emacs")
      ("doi" :follow org--open-doi-link) ("elisp" :follow org--open-elisp-link)
      ("file" :complete org-file-complete-link)
      ("ftp" :follow (lambda (path) (browse-url (concat "ftp:" path))))
      ("help" :follow org--open-help-link)
      ("http" :follow (lambda (path) (browse-url (concat "http:" path))))
      ("https" :follow (lambda (path) (browse-url (concat "https:" path))))
      ("mailto" :follow (lambda (path) (browse-url (concat "mailto:" path))))
      ("message" :follow (lambda (path) (browse-url (concat "message:" path))))
      ("news" :follow (lambda (path) (browse-url (concat "news:" path))))
      ("shell" :follow org--open-shell-link))
 org-agenda-files '("/tmp/agenda_bug.org")
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 )

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