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: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#27427: closed (26.0.50; Native line numbers lead to display
 error in company-mode popup)
Date: Sat, 15 Jul 2017 17:39:01 +0000

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Your message dated Sat, 15 Jul 2017 20:38:15 +0300
with message-id <0374e7aa-451c-878a-8543-ab0a33cc49d5 <at> yandex.ru>
and subject line Re: bug#27427: 26.0.50; Native line numbers lead to display error in company-mode popup
has caused the debbugs.gnu.org bug report #27427,
regarding 26.0.50; Native line numbers lead to display error in company-mode popup
to be marked as done.

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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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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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