bug#44303: 28.0.50; json-pretty-print-buffer creates spurious lock file

[Eli Zaretskii]

> Date: Mon, 09 Nov 2020 17:58:12 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: larsi@gnus.org, 44303@debbugs.gnu.org
> 
> > > I wonder whether we should actually cherry-pick this to the release
> > > branch.  The original recipe doesn't trigger the problem there, but
> > > that's because json-pretty-print-buffer does modify the buffer on
> > > emacs-27.  If it didn't, we'd probably have the same problem in Emacs
> > > 27.
> > 
> > Right. You can see the bug in Emacs 27 too by using a test file like
> > this instead:
> > 
> > {
> > }
> 
> OK, will cherry-pick.

Now done.