bug#56952: 29.0.50; Emoji skin-tone modifiers disrupt terminal output

[Eli Zaretskii]

> From: "J.P." <jp@neverwas.me>
> Cc: 56952@debbugs.gnu.org
> Date: Thu, 04 Aug 2022 05:55:45 -0700
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Can you tell which value of auto-composition-mode did the trick? Or
> > what is the value of tty-type on that terminal?
> 
> On Alacritty 0.10.1 (with the example configuration loaded) `tty-type'
> returns "alacritty". And doing
> 
>   (setq-default auto-composition-mode "alacritty")
> 
> inhibits auto composition. Similarly, on GNOME Terminal 3.38.3 (as
> preconfigured by Debian bullseye) `tty-type' returns "xterm-256color",
> and setting `auto-composition-mode' to the latter works as expected.
> 
> > And which file in lisp/term/ does Alacritty load when you start the
> > -nw session?
> 
> It loads lisp/term/xterm.el, I guess because `term-file-aliases' maps
> "alacritty" to "xterm". (GNOME Terminal also loads that file.)
> 
> > I'm asking because perhaps we should disable auto-composition-mode by
> > default on this terminal, like we do for the Linux console.
> 
> For the virtual console, that certainly makes sense (bug#50865). As for
> which terminal emulators support such composition, that'd likely take
> some legwork to determine. (Alacritty, for one, seems to have pegged
> this feature as low priority [1].) If special casing seems premature, I
> guess there's precedent for describing such issues in etc/PROBLEMS, as
> was done with Kitty (bug#50983).

Thanks.  Done as you suggested, and closing.