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bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen b
From: |
Eli Zaretskii |
Subject: |
bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen |
Date: |
Fri, 17 Mar 2023 18:42:43 +0200 |
> From: Sebastian Tennant <sdt@sebyte.me>
> Cc: 62237@debbugs.gnu.org
> Date: Fri, 17 Mar 2023 16:20:19 +0000
>
> > First, if you can build the latest emacs-29 branch of the Emacs Git
> > repository, please try that and tell whether the problem persists or
> > have been solved in the meantime.
>
> The photos happen to show an Emacs I built from master a couple of
> days ago, i.e. Emacs 30.0.50. If you'd still like me to test branch
> emacs-29, then let me know and I will happily do so.
No, Emacs 30 is good enough. (Your report says Emacs 28.1, which is
why I asked.)
> ** Emacs can support 24-bit color TTY without terminfo database.
> If your text-mode terminal supports 24-bit true color, but your system
> lacks the terminfo database, you can instruct Emacs to support 24-bit
> true color by setting 'COLORTERM=truecolor' in the environment. This is
> useful on systems such as FreeBSD which ships only with "etc/termcap".
>
> This lead me to investigate whether or not COLORTERM was set in my
> environment. I'm running Debian bullseye and terminfo is installed
> but, nevertheless, GNOME Terminal sets COLORTERM=truecolor by default.
What is TERM set to on that system?
> > Finally, please show the display produced by "M-x
> > list-colors-display" in both cases: when COLORTERM=truecolor is and
> > isn't set. It is important for us to know how many colors Emacs
> > uses in each situation.
>
> I've updated the screenshots to show the output of
> #'list-colors-display. Here are the links again, for your
> convenience.
>
> https://download.sebyte.me/misc/truecolor-active.png
> https://download.sebyte.me/misc/truecolor-inactive.png
This seems to say that your terminal isn't compatible with what Emacs
assumes under COLORTERM=truecolor. It also says that your terminal
actually supports only 88 colors. So you should unset COLORTERM in
your environment, or use another terminal emulator (like 256-color
Xterm or some really true-color emulator).