Bug: C-o yanks on newline in one org-mode buffer [8.2.10 (release_8.2.10 @ c:/Program Files/emacs-24.5/share/emacs/24.5/lisp/org/)]

[Leo J Buchignani III <leo.little.book@gmail.com>]

I previously submitted this bug here:
https://lists.gnu.org/archive/html/emacs-orgmode/2015-12/msg00515.html

I was advised to update my versions.

A while later, I updated to the latest standard Org Mode + Emacs
combination, and redid
my .emacs file mostly from scratch. Then I encountered the bug again.

I assume it is a bug since it appears to have no documentation and
serves no likely use.

Bug arose while writing an 82-line text heading in a 3027-line 2.3M text
.org file titled "di]ks81-ca.org". Text was mostly random thought
snippets about psychology with basic outlining, to give an idea of the
document structure and composition. Lots of top level headings;
nesting not that deep. I had about 6 panes open.

Normally, C-o opens a blank newline as expected.

Bug behavior:
With point at the beginning of a line, C-o yanks snippet
With point elsewhere, C-o behaves normally.

Snippet is a 7-word fragment of the text I was just writing. I
suspect I C-k killed the fragment immediately before the bug appeared.
Snippet is
always the same, regardless of kill-ring.

Bug appears only in the "di]ks81-ca.org" buffer; not in other .org files
or other Emacs modes.

Bug vanishes when I execute M-x org-mode in that buffer, reloading Org
Mode. Thus I conclude it must be an Org Mode bug.

I suspect it has something to do with working in >1M org files.

Cheers,
Leo

Emacs  : GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Package: Org-mode version 8.2.10 (release_8.2.10 @ c:/Program
Files/emacs-24.5/share/emacs/24.5/lisp/org/)

current state:
==============
(setq
 org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
org-babel-execute-safely-maybe)
 org-tab-first-hook '(org-hide-block-toggle-maybe
org-src-native-tab-command-maybe
              org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
          org-cycle-hide-inline-tasks org-cycle-show-empty-lines
          org-optimize-window-after-visibility-change)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-speed-command-hook '(org-speed-command-default-hook
org-babel-speed-command-hook)
 org-babel-pre-tangle-hook '(save-buffer)
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-id-link-to-org-use-id t
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '((lambda nil (visual-line-mode -1))
         #[nil "\300\301\302\303\304$\207"
           [org-add-hook change-major-mode-hook org-show-block-all
append local] 5]
         #[nil "\300\301\302\303\304$\207"
           [org-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-from-is-user-regexp nil
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-confirm-shell-link-function 'yes-or-no-p
 )