bug#65029: Italics bug when Emacs runs inside GNU Screen

[Gregory Heytings]

> > > Ping! Ping!  I'd like to resolve this issue in Emacs 29.2, if 
> > > possible. Please help me by providing the information I asked below.
> >
> > $ TERM=xterm infocmp -1 | grep -E 'ritm|sitm'
> >          ritm=\E[23m,
> >          sitm=\E[3m,
> > $ TERM=screen infocmp -1 | grep -E 'ritm|sitm'
> > $ TERM=tmux infocmp -1 | grep -E 'ritm|sitm'
> >          ritm=\E[23m,
> >          sitm=\E[3m,
>
> Thanks.
>
> This says AFAIU that screen doesn't support italics?

Yes.

> In which case it contradicts what James said:
>
> > GNU Screen added italics support on its master branch a while ago [1]. 
> > If I run Emacs (29.1) inside GNU Screen (master), there are strange 
> > font issues.
>
> Maybe that change is not yet distributed in the version of screen you 
> have installed, Gregory?

I have a fairly recent version:

$ screen --version
Screen version 4.09.00 (GNU) 30-Jan-22

A few messages were recently added to the ticket James mentioned:

https://savannah.gnu.org/bugs/?func=detailitem&item_id=36676

which IIUC mean that this issue will actually be fixed only in Screen 
5.0.0, which will be released next year.  However, I just built the latest 
version of Screen (master), and the problem is still present AFAICS.