bug#27202: 26.0.50; Eldoc mode is broken

[Dmitry Gutov <dgutov@yandex.ru>]

On 6/3/17 1:47 AM, Stephen Berman wrote:

>> Boostrapping latest master didn't fix it here.
> 
> I manually reverted this part of 2349f1df1b:

So basically all of it.

> -(define-minor-mode global-eldoc-mode
> -  "Toggle Global Eldoc mode on or off.
> -With a prefix argument ARG, enable Global Eldoc mode if ARG is
> -positive, and disable it otherwise.  If called from Lisp, enable
> -the mode if ARG is omitted or nil, and toggle it if ARG is ‘toggle’.
> -
> -If Global Eldoc mode is on, `eldoc-mode' will be enabled in all
> -buffers where it's applicable.  These are buffers that have modes
> -that have enabled eldoc support.  See `eldoc-documentation-function'."
> +(define-globalized-minor-mode global-eldoc-mode eldoc-mode turn-on-eldoc-mode
>     :group 'eldoc
> -  :global t
>     :initialize 'custom-initialize-delay
> -  :init-value t
> -  (setq eldoc-last-message nil)
> -  (if global-eldoc-mode
> -      (progn
> -	(add-hook 'post-command-hook #'eldoc-schedule-timer)
> -	(add-hook 'pre-command-hook #'eldoc-pre-command-refresh-echo-area))
> -    (remove-hook 'post-command-hook #'eldoc-schedule-timer)
> -    (remove-hook 'pre-command-hook #'eldoc-pre-command-refresh-echo-area)))
> +  :init-value t)
> 
> then rebuilt Emacs (just make, not bootstrap), and now Eldoc in the
> modeline works here again.

Do you have an explanation why one version of the code works, and 
another doesn't?