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bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen b
From: |
Robert Pluim |
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 16:39:19 +0100 |
>>>>> On Fri, 17 Mar 2023 14:15:34 +0200, Eli Zaretskii <eliz@gnu.org> said:
Eli> If the problem persists in Emacs 29, then please tell why you need to
Eli> use COLORTERM=truecolor at all. Emacs uses that as fallback, in case
Eli> all the other known methods of specifying true color via terminfo
Eli> didn't work. This fallback relies on an assumption regarding the
Eli> commands to send to the terminal to turn on and off the colors, see
Eli> the file term.c in the Emacs source tree around line 4160. The other
Eli> known methods of specifying support for true color use
Eli> 'setf24'/'setb24' capabilities, or the 'RGB' flag is set by terminfo.
Eli> So setting COLORTERM=truecolor is the responsibility of the user: the
Eli> user should _only_ set it if the text-mode terminal actually supports
Eli> true color using the commands Emacs expects to work in that case, but
Eli> Emacs cannot detect that without COLORTERM=truecolor being set. Is
Eli> that your case?
Eli> Finally, please show the display produced by "M-x list-colors-display"
Eli> in both cases: when COLORTERM=truecolor is and isn't set. It is
Eli> important for us to know how many colors Emacs uses in each situation.
For reasons unknown to me, I actually have COLORTERM=truecolor set in
my environment, which tickles this issue. But the only reason it does
so is because under screen by default I get
TERM=screen.xterm-256color. If I do
TERM=xterm-256color src/emacs -Q -nw
then I get 24bit colour (according to `display-color-cells')
I guess we could drop the 'screen.' prefix in
`init_display_interactive', although that does feel like a hack.
Robert
--
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Sebastian Tennant, 2023/03/17
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/17
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen,
Robert Pluim <=
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/17
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Robert Pluim, 2023/03/17
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/17
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Robert Pluim, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Robert Pluim, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Robert Pluim, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Eli Zaretskii, 2023/03/18
- bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen, Robert Pluim, 2023/03/20