bug#64821: 30.0.50; write-region errs when overwriting an already open file

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: 64821@debbugs.gnu.org
> Date: Tue, 25 Jul 2023 08:16:23 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Expected: No error is thrown.
> >
> > Thanks, should be fixed now on the master branch.
> 
> I confirm the fix. Thanks!

Thanks for testing; closing the bug.