Bug: imenu and eldoc breadcrumb false-positive match non-uppercase todo keywords

[Georgiy Tugai <georgiy.tugai@gmail.com>]

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GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.20.3) of 2016-05-06 on arojas

Org-mode version 8.3.4 (8.3.4-67-g610564-elpaplus @ ~/.emacs.d/elpa/org-plus-contrib-20160523/)

Steps to reproduce
==================

  1) Org file with at least one first-level heading containing a TODO
     keyword, with at least one of it's letters lowercased.

  2) Rescan imenu, look at it's contents

  3) Put point on the heading with lowercased TODO keyword, look at the
     eldoc breadcrumb


Expected behaviour
==================

  In a manner consistent with the rest of Org (font-locking, C-c C-t,
  etc.), TODO keywords which are not all uppercase are treated as normal
  text.

  If the heading is "* Todo list", imenu should show "Todo.list" and the
  eldoc breadcrumb should show "Todo list".


Actual behaviour
================

  Imenu shows "list", eldoc breadcrumb shows "list" -- as if "Todo" is a
  TODO keyword, even though it is not font-locked as such, or treated as
  a keyword by other parts of Org (such as the agenda).

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