bug#27036: 25.1; Blocking call to accept-process-output with quit inhibited!!

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Thu, 25 May 2017 08:51:56 -0400
> Cc: Eli Zaretskii <eliz@gnu.org>, 27036@debbugs.gnu.org
> 
> > eldoc-print-current-symbol-info uses with-demoted-errors, which expands into
> > a condition-case, but does that inhibit quitting somehow?
> 
> Looks like it's in timer-event-handler:
> 
> (defun timer-event-handler (timer)
>   ...
>   (let ((inhibit-quit t))

So I guess octave-eldoc-function-signatures should temporarily reset
inhibit-quit?