GNU bug report logs - #45038
27.1; blank display

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Message #23 received at 45038 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 45038 <at> debbugs.gnu.org, Emacs-hacker2018 <at> jovi.net, stefan <at> marxist.se
Subject: Re: bug#45038: 27.1; blank display
Date: Fri, 4 Dec 2020 13:11:25 +0000

On Fri, Dec 04, 2020 at 02:02:03PM +0200, Eli Zaretskii wrote:
> > Date: Fri, 4 Dec 2020 10:53:22 +0000
> > From: Alan Third <alan <at> idiocy.org>
> > Cc: Eli Zaretskii <eliz <at> gnu.org>, 45038 <at> debbugs.gnu.org,
> > 	Devon Sean McCullough <Emacs-hacker2018 <at> jovi.net>
> > 
> > > > I think this is a known problem already solved in the repository.  can
> > > > you try building the latest emacs-27 branch?
> > > 
> > > I could have sworn I saw this the other week on master.  If you
> > > believe it is fixed, then perhaps I was using an old version at the
> > > time.  Please ignore me for now, I'll report back if I see it again.
> > 
> > It should be fixed on master, but not in any version of Emacs 27. It's
> > a large change so was never back ported.
> 
> If it isn't reasonable to release Emacs 27.2 with this problem, we may
> wish backporting the change even though it is large.
> 
> How easy is it to bump into this problem, and is there an easy
> workaround when you do?

It's unusual to have the display completely blanking, most people just
see small localised glitches. Usually it can be solved by forcing a
redisplay of some sort, which is what you can see in Devon's example
as he moves the cursor across the lines, which forces redisplay of
those lines.

I would prefer not to back-port to Emacs 27, but if you think it's
necessary I'll give it a go.
-- 
Alan Third

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