GNU bug report logs - #38563
27.0.50; Company popup renders with newlines (?) inheriting the bg properties of the character at next line's bol

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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#38563: closed (27.0.50; Company popup renders with newlines
 (?) inheriting the bg properties of the character at next line's bol)
Date: Sat, 21 Dec 2019 13:23:01 +0000

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Your message dated Sat, 21 Dec 2019 15:22:46 +0200
with message-id <3c20fcbd-5d36-9a33-dd52-dddaab219fad <at> yandex.ru>
and subject line Re: bug#38563: 27.0.50; Company popup renders with newlines (?) inheriting the bg properties of the character at next line's bol
has caused the debbugs.gnu.org bug report #38563,
regarding 27.0.50; Company popup renders with newlines (?) inheriting the bg properties of the character at next line's bol
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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38563: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38563
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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Company popup renders with newlines (?) inheriting the bg
 properties of the character at next line's bol
Date: Wed, 11 Dec 2019 03:13:59 +0200

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Here's an unfortunate new behavior which I didn't have time to report
or properly describe before.

When the next line starts on a character that has a distinct background,
that background is inherited when displaying newlines inside the display
string that renders the popup.

Here are two ways I usually trigger it:

1. Initiate completion on the "Author:" line of a LogEdit buffer (the
next line is an inverse-video line).

2. Have at least one space at the beginning of a line, and have
whitespace-mode on to highlight it in red. Then initiate completion on
the preceding line.

Screenshots are attached.

Needless to say, the latest Emacs 26 doesn't exhibit this problem.

[Screenshot from 2019-12-11 03-00-35.png (image/png, attachment)]

[Screenshot from 2019-12-11 03-00-41.png (image/png, attachment)]

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 38563-done <at> debbugs.gnu.org
Subject: Re: bug#38563: 27.0.50; Company popup renders with newlines (?)
 inheriting the bg properties of the character at next line's bol
Date: Sat, 21 Dec 2019 15:22:46 +0200

On 21.12.2019 9:53, Eli Zaretskii wrote:

> Yes, this looks like a good solution to me.

Thank you for verifying. Then I'm closing this report.

> In fact, I was about to
> ask you to make a similar (less elegant) change,

Like temporarily changing the face of the underlying character? Yeah, I 
would have paused at that idea.

> because I couldn't
> think of a way to resolve this in core: when a face explicitly asks to
> extend itself past EOL, we cannot in good faith refrain from doing so
> in some use cases.

Let's see if other third-party issues come up, then.

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