Hi Eli,

That was my feeling as well - that there were potentially new changes which were released only to the Insider Ring (which I'm in), and which break Emacs. Therefore I thought it was a good idea to post the bug now, so that if it turns out that this really is Emacs-breaking, you have some lead time to address it. I reverted my last update, though, and I believe I have taken at last one build since then, but I haven't seen it come back.

Best regards,
Patrick

On Mon, Apr 1, 2019 at 12:26 PM Eli Zaretskii <eliz@gnu.org> wrote:
> From: Noam Postavsky <npostavs@gmail.com>
> Date: Mon, 1 Apr 2019 15:15:52 -0400
> Cc: 34688@debbugs.gnu.org
>
> > In GNU Emacs 26.1 (build 1, x86_64-w64-mingw32)
> >  of 2018-05-30 built on CIRROCUMULUS
> > Repository revision: 07f8f9bc5a51f5aa94eb099f3e15fbe0c20ea1ea
> > Windowing system distributor 'Microsoft Corp.', version 10.0.18342
>
> I can't reproduce this on my Windows 10 system. Emacs reports
>
>     Windowing system distributor 'Microsoft Corp.', version 10.0.17763
>
> So perhaps I have an older version, even though I have applied all
> updates (as far as I know)?

AFAIK, Windows 10 build 18342 is an "insider preview", so I think not
everyone gets it.  It could also mean there are some bugs in that
build, or (I hope not) some new "features" that cause Emacs trouble.