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Re: Emacs 24.5 second release candidate

From: Alan Mackenzie
Subject: Re: Emacs 24.5 second release candidate
Date: Thu, 2 Apr 2015 16:12:56 +0000
User-agent: Mutt/1.5.23 (2014-03-12)

Hello, Eli.

On Thu, Apr 02, 2015 at 06:21:37PM +0300, Eli Zaretskii wrote:
> > Date: Thu, 2 Apr 2015 14:02:28 +0000
> > From: Alan Mackenzie <address@hidden>
> > Cc: Glenn Morris <address@hidden>, Stefan Monnier <address@hidden>,
> >     emacs-devel <address@hidden>

> > Bug #20245 has happened: in it, in a C++ Mode buffer, bits of text are
> > randomly losing their fontification.

> > Would it be possible to delay the next release candidate until I've had a
> > chance perhaps to diagnose this?

> Do you have an estimation of how much time you will need?

Perhaps this evening, perhaps tomorrow morning.  It's one of these nasty
little bugs which looks totally wierd and random until one stumbles upon
the cause, after which it takes 2 minutes to fix.

> Also, was this bug caused by a recent commit, and if so, which one?

No, I don't think it was.  I think it was "unmasked" by a recent bug
"fix", d69e9f1c24f37f36af33b0468c5a4e100dbb09b6 from 2015-02-01.  Oleh
Krehel, the OP of the pertinent bug #20245, says that with that change
reversed, the bug symptoms don't manifest themselves.  I haven't checked
this yet, but it sounds plausible.  That fix is actually incomplete,
requiring Monday/yesterday's fix to make it complete.

I'm beginning to come round to the view that perhaps it might be best
just to take d69e9f1c24f37f36af33b0468c5a4e100dbb09b6 out of Emacs 24.5,
as Oleh Krehel has explicitly suggested.

Alan Mackenzie (Nuremberg, Germany).

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