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

[Sebastian Tennant]

Quoth Eli Zaretskii <eliz@gnu.org>
on Sat, 18 Mar 2023 17:13:45 +0200:
> […] Or does GNOME itself support true color?

GNOME Terminal/VTE does support true color, but why continue to employ
"a long-obsolete slang-only variable used to work around broken
termcap/terminfo entries"?

Another wrinkle in all this is the fact that I start Emacs at screen
start time (rather than a shell) via an entry in my .screenrc.  This
means the environment is effectively exported and explains why the
value of COLORTERM is picked up by Emacs.  If I allowed screen to fire
up a shell and then started Emacs from that shell, this problem would
never have reared its ugly head!