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Subject: bug#45231: 27.1; Fix support for colored underlines on terminal mode
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Support for (:underline (:style wave :color foo) when on terminal move
is missing. See src/xfaces.c, and the line:

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return false;=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* ttys can't use col=
ored underlines */

Since ~3 years, support for curly underscores and colored underscores is
present in several terminal emulators. At least:
- Kitty: https://github.com/kovidgoyal/kitty/blob/master/protocol-extension=
s.asciidoc
- VTE
- iTerm2: https://gitlab.com/gnachman/iterm2/-/issues/6382

Example of implementations from other editors, such as Vim and Neovim
among others:
- https://github.com/vim/vim/issues/1306
- https://github.com/vim/vim/pull/2405
- https://github.com/neovim/neovim/issues/7479


In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cair=
o version 1.16.0)
=C2=A0of 2020-11-08, modified by Debian built on x86-ubc-01
System Description: Debian GNU/Linux bullseye/sid

Recent messages:
Auto-saving...done
Auto-saving...done
Mark set [2 times]
Auto-saving...done
Auto-saving...done
g w
Send this bug report to the Emacs maintainers? (y or n) y
Sending...
Sending via mail...
evil-ex-find-next: Search failed: "No search pattern"

Configured using:
=C2=A0'configure --build x86_64-linux-gnu --prefix=3D/usr
=C2=A0--sharedstatedir=3D/var/lib --libexecdir=3D/usr/lib
=C2=A0--localstatedir=3D/var/lib --infodir=3D/usr/share/info
=C2=A0--mandir=3D/usr/share/man --enable-libsystemd --with-pop=3Dyes
=C2=A0--enable-locallisppath=3D/etc/emacs:/usr/local/share/emacs/27.1/site-=
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share/emacs/site-lisp
=C2=A0--with-sound=3Dalsa --without-gconf --with-mailutils --build
=C2=A0x86_64-linux-gnu --prefix=3D/usr --sharedstatedir=3D/var/lib
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Configured features:
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INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
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JSON PDUMPER LCMS2 GMP

Important settings:
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=C2=A0 value of $LC_NUMERIC: en_DK.UTF-8
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Major mode: Message

Minor modes in effect:
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=C2=A0 ivy-rich-mode: t
=C2=A0 ivy-mode: t
=C2=A0 evil-goggles-mode: t
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=C2=A0 evil-snipe-override-mode: t
=C2=A0 evil-snipe-mode: t
=C2=A0 evil-snipe-override-local-mode: t
=C2=A0 evil-snipe-local-mode: t
=C2=A0 gcmh-mode: t
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=C2=A0 async-bytecomp-package-mode: t
=C2=A0 mml-mode: t
=C2=A0 persp-mode: t
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=C2=A0 evil-mode: t
=C2=A0 evil-local-mode: t
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=C2=A0 global-eldoc-mode: t
=C2=A0 electric-indent-mode: t
=C2=A0 mouse-wheel-mode: t
=C2=A0 file-name-shadow-mode: t
=C2=A0 global-font-lock-mode: t
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=C2=A0 size-indication-mode: t
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=C2=A0 line-number-mode: t
=C2=A0 auto-fill-function: yas--auto-fill
=C2=A0 visual-line-mode: t
=C2=A0 transient-mark-mode: t
=C2=A0 abbrev-mode: t

Load-path shadows:
/usr/share/emacs/site-lisp/llvm-11/llvm-mode hides /usr/share/emacs/site-li=
sp/llvm-6.0/llvm-mode
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e-lisp/llvm-6.0/tablegen-mode
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lvm-6.0/emacs
/usr/share/emacs/site-lisp/llvm-11/llvm-mode hides /usr/share/emacs/site-li=
sp/llvm-7/llvm-mode
/usr/share/emacs/site-lisp/llvm-11/tablegen-mode hides /usr/share/emacs/sit=
e-lisp/llvm-7/tablegen-mode
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lvm-7/emacs
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sp/llvm-8/llvm-mode
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lvm-9/emacs
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/sh=
are/emacs/site-lisp/elpa/dpkg-dev-el-37.0/debian-autoloads
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el-autoloads hides /usr=
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/usr/share/emacs/site-lisp/elpa/debian-el-37/apt-sources hides /usr/share/e=
macs/site-lisp/elpa-src/debian-el-37/apt-sources
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el hides /usr/share/ema=
cs/site-lisp/elpa-src/debian-el-37/debian-el
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-bug hides /usr/share/em=
acs/site-lisp/elpa-src/debian-el-37/debian-bug
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el-pkg hides /usr/share=
/emacs/site-lisp/elpa-src/debian-el-37/debian-el-pkg
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s/site-lisp/elpa-src/debian-el-37/deb-view
/usr/share/emacs/site-lisp/elpa/debian-el-37/apt-utils hides /usr/share/ema=
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/usr/share/emacs/site-lisp/elpa/debian-el-37/gnus-BTS hides /usr/share/emac=
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/usr/share/emacs/site-lisp/elpa/debian-el-37/preseed hides /usr/share/emacs=
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/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/sh=
are/emacs/site-lisp/elpa-src/debian-el-37/debian-autoloads
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re/emacs/site-lisp/elpa-src/devscripts-40/devscripts-pkg
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sr/share/emacs/site-lisp/elpa-src/devscripts-40/devscripts-autoloads
/usr/share/emacs/site-lisp/elpa/devscripts-40/pbuilder-mode hides /usr/shar=
e/emacs/site-lisp/elpa-src/devscripts-40/pbuilder-mode
/usr/share/emacs/site-lisp/elpa/devscripts-40/devscripts hides /usr/share/e=
macs/site-lisp/elpa-src/devscripts-40/devscripts
/usr/share/emacs/site-lisp/elpa/devscripts-40/pbuilder-log-view-mode hides =
/usr/share/emacs/site-lisp/elpa-src/devscripts-40/pbuilder-log-view-mode
/usr/share/emacs/site-lisp/elpa/dpkg-dev-el-37.0/debian-copyright hides /us=
r/share/emacs/site-lisp/elpa-src/dpkg-dev-el-37.0/debian-copyright
/usr/share/emacs/site-lisp/elpa/dpkg-dev-el-37.0/readme-debian hides /usr/s=
hare/emacs/site-lisp/elpa-src/dpkg-dev-el-37.0/readme-debian
/usr/share/emacs/site-lisp/elpa/dpkg-dev-el-37.0/dpkg-dev-el hides /usr/sha=
re/emacs/site-lisp/elpa-src/dpkg-dev-el-37.0/dpkg-dev-el
/usr/share/emacs/site-lisp/elpa/dpkg-dev-el-37.0/debian-control-mode hides =
/usr/share/emacs/site-lisp/elpa-src/dpkg-dev-el-37.0/debian-control-mode
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/sh=
are/emacs/site-lisp/elpa-src/dpkg-dev-el-37.0/debian-autoloads
/usr/share/emacs/site-lisp/elpa/dpkg-dev-el-37.0/dpkg-dev-el-autoloads hide=
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/usr/share/emacs/site-lisp/latex-cjk-thai/thai-word hides /usr/share/emacs/=
27.1/lisp/language/thai-word

Features:
(mailalias mailclient evil-collection-help help shadow sort mail-extr
emacsbug sendmail amx cursor-sensor evil-traces evil-ex lsp-mode
lsp-protocol spinner network-stream smartparens-markdown markdown-mode
edit-indirect inline ht ewoc dash-functional bindat
flycheck-golangci-lint evil-collection-go-mode go-mode find-file ffap
etags fileloop flycheck-cask git-gutter evil-collection-vc-git vc-git
jka-compr auto-minor-mode disp-table whitespace evil-embrace
evil-surround embrace expand-region text-mode-expansions
the-org-mode-expansions er-basic-expansions expand-region-core
expand-region-custom eros highlight-quoted rainbow-delimiters
display-fill-column-indicator vi-tilde-fringe highlight-numbers
parent-mode display-line-numbers flyspell-lazy flycheck-popup-tip
evil-collection-popup popup ispell flyspell face-remap saveplace so-long
evil-collection-which-key which-key better-jumper company-capf company
evil-collection-ivy ivy-avy avy ivy-rich counsel xdg ivy-xref
evil-collection-xref xref project swiper ivy delsel ivy-faces
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Memory information:
((conses 16 651675 645417)
=C2=A0(symbols 48 47659 74)
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--=20
V=C3=ADctor Cuadrado Juan=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0me@HIDDEN

PGP key ID: 4096R: 0xA2591E231E251F36
Key fingerprint: E3C5 114C 0C5B 4C49 BA03=C2=A0=C2=A00991 A259 1E23 1E25 1F=
36
My signed E-Mails are trustworthy.

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Subject: bug#45231: Acknowledgement (27.1; Fix support for colored
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Subject: bug#45231: 27.1; Fix support for colored underlines on terminal mode
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severity 45231 wishlist
thanks

> From: Víctor Cuadrado Juan <me@HIDDEN>
> Date: Sun, 13 Dec 2020 23:31:34 +0100
> 
> Support for (:underline (:style wave :color foo) when on terminal move
> is missing. See src/xfaces.c, and the line:
> 
>         return false;           /* ttys can't use colored underlines */
> 
> Since ~3 years, support for curly underscores and colored underscores is
> present in several terminal emulators. At least:
> - Kitty: https://github.com/kovidgoyal/kitty/blob/master/protocol-extensions.asciidoc
> - VTE
> - iTerm2: https://gitlab.com/gnachman/iterm2/-/issues/6382

Patches to support this in Emacs are welcome (although it's a pity
that these features aren't based on terminfo capabilities, AFAICT).

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 (message from =?utf-8?Q?V=C3=ADctor?= Cuadrado Juan on Sun, 13 Dec 2020
 23:31:34 +0100)
Subject: Re: bug#45231: 27.1;
 Fix support for colored underlines on terminal mode
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severity 45231 wishlist
thanks

> From: Víctor Cuadrado Juan <me@HIDDEN>
> Date: Sun, 13 Dec 2020 23:31:34 +0100
> 
> Support for (:underline (:style wave :color foo) when on terminal move
> is missing. See src/xfaces.c, and the line:
> 
>         return false;           /* ttys can't use colored underlines */
> 
> Since ~3 years, support for curly underscores and colored underscores is
> present in several terminal emulators. At least:
> - Kitty: https://github.com/kovidgoyal/kitty/blob/master/protocol-extensions.asciidoc
> - VTE
> - iTerm2: https://gitlab.com/gnachman/iterm2/-/issues/6382

Patches to support this in Emacs are welcome (although it's a pity
that these features aren't based on terminfo capabilities, AFAICT).

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