bug#62237: 28.1 or higher: 24-bit true color breaks colours in Emacsen built without X under GNU Screen

[Robert Pluim]

>>>>> On Sat, 18 Mar 2023 15:29:52 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: sdt@sebyte.me,  62237@debbugs.gnu.org
    >> Date: Sat, 18 Mar 2023 12:44:45 +0100
    >> 
    >> >>>>> On Sat, 18 Mar 2023 12:37:30 +0200, Eli Zaretskii <eliz@gnu.org> 
said:
    >> 
    Eli> Then I guess we should install your proposed fix in init_tty.
    >> 
    >> In emacs-29? That seems a bit radical. Patch below in any case

    Eli> Yes, I think in emacs-29.  Why "radical"?

Changing the interpretation of the userʼs TERM seems pretty radical to
me, even if it will tend to improve usersʼ experience.

    >> I guess we could do something with not checking COLORTERM under screen
    >> instead.

    Eli> That's a separate issue, from where I stand.  Users can unset
    Eli> COLORTERM, but their true terminal type will still be "hidden" behind
    Eli> the "screen." prefix, won't it?  The terminal type is about more than
    Eli> just the colors.  Or does terminfo know about this "screen." business?

I have both a 'screen.xterm-256color' and a 'xterm-256color' terminfo
file. I donʼt think terminfo does any prefix stripping, as thereʼs a
whole bunch of screen.$TERM files, which would be unnecessary if
stripping were happening.

Perhaps the best thing to do is put an entry in etc/PROBLEMS?

Robert
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