GNU bug report logs - #27427
26.0.50; Native line numbers lead to display error in company-mode popup

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alexander Miller <alexanderm <at> web.de>
Subject: bug#27427: closed (Re: bug#27427: 26.0.50; Native line numbers
 lead to display error in company-mode popup)
Date: Sat, 15 Jul 2017 17:39:02 +0000

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Your bug report

#27427: 26.0.50; Native line numbers lead to display error in company-mode popup

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 27427 <at> debbugs.gnu.org.

-- 
27427: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=27427
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: alexanderm <at> web.de, 27427-done <at> debbugs.gnu.org
Subject: Re: bug#27427: 26.0.50; Native line numbers lead to display error in
 company-mode popup
Date: Sat, 15 Jul 2017 20:38:15 +0300

On 7/14/17 10:04 AM, Eli Zaretskii wrote:

> That's because posn-at-point "simulates" redisplay: it performs all
> the layout calculations exactly like redisplay would, but without
> actually displaying anything.

Very cool. In that case, let's consider this issue resolved.

I've already pushed this fix and cut a new release now.

> (If you think posn-at-point takes that information from what is
> displayed on the glass, or from some of its internal representation,
> then that's not what it does, because the internal representation of
> what's on the glass is many times outdated when a Lisp program runs,
> so it cannot be trusted.)

I was thinking there was some change canary (or many of them), and the 
"internal representation" is recomputed when any of those values change.

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From: Alexander Miller <alexanderm <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; Native line numbers lead to display error in company-mode
 popup
Date: Mon, 19 Jun 2017 18:50:18 +0200

As requested by Eli on reddit, a proper bug report about the company issue:

Using the new native line numbers in emacs -q
alongside company mode results in line numbers not being rendered in
lines where the company-mode popup is active. This is the same as in
(n)linum-mode, however the company popup, except the first line, is also
shifted to the left into the space line numbers used to occupy:
http://imgur.com/xHf2mlp

It looks like there's a general issue of overlay using packages not
expecting the space now being used by line numbers. For example the
fill-column-indicator package draws its indicator too far to the left
and swerves off with the comments at the top for some reason:
http://imgur.com/WHcrhdC
(Don't know why the company popup looks even worse here, that doesn't
happen when I load my full config).


In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.15)
of 2017-06-18 built on a-laptop
Repository revision: 7277c0fca7dab9f1b311c3eba5c42fd17acc3593
Windowing system distributor 'The X.Org Foundation

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