bug#62876: 28.2; strikethrough text on TTY not showing

[Eli Zaretskii]

merge 62876 62265
thanks

> From: Ivan Kuraj <ivanko@csail.mit.edu>
> Date: Sat, 15 Apr 2023 21:11:00 -0400
> 
> 
> Strikethrough text is not displaying properly when Emacs is started with 
> `emacs -nw`. I tried xterm (Arch Linux), iTerm2 (MacOS), xterm/iterm2 over 
> ssh. Tried Emacs 28.2 (Linux/Macos, with/without native compilation, 
> with/without Doom Emacs).
> 
> On xterm strikethrough is underlined. Terminals, as well as GUI Emacs, 
> properly display strikethrough. (Terminals on executing `echo -e 
> "\e[9mstrikethrough\e[0m"`.) TERM is set so that the terminals confirm 
> support for "smxx":
> > $ TERM=xterm-24bit infocmp -x | grep -E '(rm|sm)xx'
> > 79:     kpZRO=\EOp, rmxx=\E[29m,
> > 82:     smxx=\E[9m, xm=\E[<%i%p3%d;%p1%d;%p2%d;%?%p4%tM%em%;,
> 
> If I am not mistaken, this was working properly on prior versions of Emacs. 
> (As confirmed, e.g. here: 
> https://emacs.stackexchange.com/questions/43722/emacsclient-nw-and-strikethrough-text-in-org-mode)

This is a duplicate of bug#62265, for which I just installed a fix on
the emacs-29 branch.  Please try that branch if you can.

P.S. Support for strikethrough on TTY frames was added to Emacs in
version 28.1.