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

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

[James Ipswich via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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.

All text that should be italicized, e.g. /text/ in org-mode or
annotations provided by marginalia-mode, is underlined. Oddly, text that
should not be italicized, e.g. the menu bar and the status bar, is in
fact italicized. I am running xterm (383) with DejaVu fonts. Text
displayed inside GNU Screen but outside Emacs is properly italicized.

If I replace xterm with urxvt or kitty, the issue persists. If I replace
DejaVu with other fonts, the issue also persists. If I replace GNU
Screen with Tmux, all italics are displayed correctly.

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

In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: NixOS 23.11 (Tapir)

Configured using:
 'configure
 --prefix=/nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-xft --with-cairo --with-native-compilation --with-tree-sitter
 --with-xinput2'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $EMACSLOADPATH: 
  value of $EMACSNATIVELOADPATH: /nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/native-lisp::
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Message

Minor modes in effect:
  display-time-mode: t
  mml-mode: t
  pdf-occur-global-minor-mode: t
  override-global-mode: t
  marginalia-mode: t
  vertico-mode: t
  savehist-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: message-do-auto-fill
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
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/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/transient-20230602.2121/transient hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/transient
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/ob-core hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/ob-core
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/ob-emacs-lisp hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/ob-emacs-lisp
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/ol-bibtex hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/ol-bibtex
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/org-id hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/org-id
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/ol-w3m hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/ol-w3m
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/org-keys hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/org-keys
/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/oc-bibtex hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/oc-bibtex
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/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/ob-ditaa hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/ob-ditaa
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/nix/store/2i2vc9v4q5256w6dskswf4vqgma7l9zf-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.6/org-agenda hides /nix/store/gr7ylnf9qz3lqw552gcr8dxbliw9pnvj-emacs-29.1-rc1/share/emacs/29.1/lisp/org/org-agenda
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bug#65029: Italics bug when Emacs runs inside GNU Screen

[Eli Zaretskii]

> Date: Wed, 02 Aug 2023 23:37:54 +0000
> From:  James Ipswich via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 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.
> 
> All text that should be italicized, e.g. /text/ in org-mode or
> annotations provided by marginalia-mode, is underlined. Oddly, text that
> should not be italicized, e.g. the menu bar and the status bar, is in
> fact italicized. I am running xterm (383) with DejaVu fonts. Text
> displayed inside GNU Screen but outside Emacs is properly italicized.
> 
> If I replace xterm with urxvt or kitty, the issue persists. If I replace
> DejaVu with other fonts, the issue also persists. If I replace GNU
> Screen with Tmux, all italics are displayed correctly.
> 
> [1] https://savannah.gnu.org/bugs/?func=detailitem&item_id=36676

I guess Screen changes the terminfo entry of the terminal in some way?
Please step with GDB through init_tty and see what we get when we
query terminfo about the italics:

  tty->TS_enter_italic_mode = tgetstr ("ZH", address);

Please do this inside and outside of Screen, with the same terminal
emulator, and post the results.

Thanks.

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

[Eli Zaretskii]

Ping!  Can we please make some progress with this issue?

> Cc: 65029@debbugs.gnu.org
> Date: Thu, 03 Aug 2023 09:46:13 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > Date: Wed, 02 Aug 2023 23:37:54 +0000
> > From:  James Ipswich via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> > 
> > 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.
> > 
> > All text that should be italicized, e.g. /text/ in org-mode or
> > annotations provided by marginalia-mode, is underlined. Oddly, text that
> > should not be italicized, e.g. the menu bar and the status bar, is in
> > fact italicized. I am running xterm (383) with DejaVu fonts. Text
> > displayed inside GNU Screen but outside Emacs is properly italicized.
> > 
> > If I replace xterm with urxvt or kitty, the issue persists. If I replace
> > DejaVu with other fonts, the issue also persists. If I replace GNU
> > Screen with Tmux, all italics are displayed correctly.
> > 
> > [1] https://savannah.gnu.org/bugs/?func=detailitem&item_id=36676
> 
> I guess Screen changes the terminfo entry of the terminal in some way?
> Please step with GDB through init_tty and see what we get when we
> query terminfo about the italics:
> 
>   tty->TS_enter_italic_mode = tgetstr ("ZH", address);
> 
> Please do this inside and outside of Screen, with the same terminal
> emulator, and post the results.
> 
> Thanks.
> 
> 
> 
> 

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

[Eli Zaretskii]

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.

> Cc: 65029@debbugs.gnu.org
> Date: Sat, 12 Aug 2023 09:45:39 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Ping!  Can we please make some progress with this issue?
> 
> > Cc: 65029@debbugs.gnu.org
> > Date: Thu, 03 Aug 2023 09:46:13 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > Date: Wed, 02 Aug 2023 23:37:54 +0000
> > > From:  James Ipswich via "Bug reports for GNU Emacs,
> > >  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> > > 
> > > 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.
> > > 
> > > All text that should be italicized, e.g. /text/ in org-mode or
> > > annotations provided by marginalia-mode, is underlined. Oddly, text that
> > > should not be italicized, e.g. the menu bar and the status bar, is in
> > > fact italicized. I am running xterm (383) with DejaVu fonts. Text
> > > displayed inside GNU Screen but outside Emacs is properly italicized.
> > > 
> > > If I replace xterm with urxvt or kitty, the issue persists. If I replace
> > > DejaVu with other fonts, the issue also persists. If I replace GNU
> > > Screen with Tmux, all italics are displayed correctly.
> > > 
> > > [1] https://savannah.gnu.org/bugs/?func=detailitem&item_id=36676
> > 
> > I guess Screen changes the terminfo entry of the terminal in some way?
> > Please step with GDB through init_tty and see what we get when we
> > query terminfo about the italics:
> > 
> >   tty->TS_enter_italic_mode = tgetstr ("ZH", address);
> > 
> > Please do this inside and outside of Screen, with the same terminal
> > emulator, and post the results.
> > 
> > Thanks.
> > 
> > 
> > 
> > 
> 
> 
> 
> 

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,

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

[Eli Zaretskii]

> Date: Sat, 19 Aug 2023 09:36:08 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: james.ipswich@proton.me, 65029@debbugs.gnu.org
> 
> 
> >
> > 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?  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?

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.

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

[Eli Zaretskii]

> Date: Sat, 19 Aug 2023 10:57:29 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: james.ipswich@proton.me, 65029@debbugs.gnu.org
> 
> > 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.

And their version from master also yields the same result from
infocmp?  If so, in what way they "implemented" support for italics?

Should the terminfo database be perhaps updated when you install a
newer version of Screen?

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

[Gregory Heytings]

>
> And their version from master also yields the same result from infocmp?
>

It's not the exact same result, but AFAICS it does not advertise the 
italic mode capability either.

>
> If so, in what way they "implemented" support for italics?
>

I don't know, sorry.  I guess it was only half-implemented.

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

[Gregory Heytings]

>> If so, in what way they "implemented" support for italics?
>
> I don't know, sorry.  I guess it was only half-implemented.
>

In any case, I don't think there's much we can do on Emacs' side ATM.  We 
have to wait until italic mode has been properly implemented by Screen. 
FWIW, italic mode works in Emacs under Tmux.

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

[Eli Zaretskii]

> Date: Sat, 19 Aug 2023 11:27:49 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: 65029@debbugs.gnu.org, james.ipswich@proton.me
> 
> > If so, in what way they "implemented" support for italics?
> >
> 
> I don't know, sorry.  I guess it was only half-implemented.

OK, thanks.

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

[Eli Zaretskii]

> Date: Sat, 19 Aug 2023 11:27:49 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: 65029@debbugs.gnu.org, james.ipswich@proton.me
> 
> > If so, in what way they "implemented" support for italics?
> >
> 
> I don't know, sorry.  I guess it was only half-implemented.

I've now asked the Screen developers to help us with understanding the
way this feature is implemented in the development version of Screen.
See https://savannah.gnu.org/bugs/index.php?36676#comment20 for
details.

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

[Andreas Schwab]

On Aug 19 2023, Gregory Heytings wrote:

>>
>> And their version from master also yields the same result from infocmp?
>>
>
> It's not the exact same result, but AFAICS it does not advertise the
> italic mode capability either.

Note that terminfo files are distributed by ncurses, independent of
screen or tmux.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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

[Gregory Heytings]

>>> And their version from master also yields the same result from 
>>> infocmp?
>>
>> It's not the exact same result, but AFAICS it does not advertise the 
>> italic mode capability either.
>
> Note that terminfo files are distributed by ncurses, independent of 
> screen or tmux.
>

Yes and no.  It's correct that the standard terminfo files are distributed 
by ncurses, but ncurses does not create them out of thin air.  And screen 
master contains a terminfo source file, which does not advertise the 
italic mode capability.