bug#34763: 27.0.50; url-retrieve-synchronously misbehaves inside eldoc-documentation-function

[Eli Zaretskii]

> Cc: 34763@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 4 Apr 2019 02:37:49 +0300
> 
> On 15.03.2019 17:49, Eli Zaretskii wrote:
> 
> > The code in the functions that react to quit-flag being non-nil should
> > be audited.  They don't look clean to me, FWIW, and we don't generally
> > do such things from Lisp, we normally quit on the C level.  Maybe this
> > whole sub-feature, whereby we show a message for interrupted
> > transfers, should be rethought.
> 
> Apparently the idea is to handle quits, including contexts where 
> inhibit-quit is t (947612be2c71d2478179694e8dfa538b9e8e07c1).
> 
> So url-retrieve-synchronously uses with-local-quit around 
> accept-process-output, and I guess the idea was to handle quits inside 
> debugging output calls.

If that's the intent, why does it need to explicitly quit in Lisp?
Just letting the code leave the form where inhibit-quit is non-nil
will let Emacs quit at the first opportunity, with no need for any
Lisp code for that.