GNU bug report logs - #65029
Italics bug when Emacs runs inside GNU Screen

Previous Next

Full log

Message #8 received at 65029 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: James Ipswich <james.ipswich <at> proton.me>
Cc: 65029 <at> debbugs.gnu.org
Subject: Re: bug#65029: Italics bug when Emacs runs inside GNU Screen
Date: Thu, 03 Aug 2023 09:46:13 +0300

> 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 <at> 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.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.