From 41b2446555a6e99c8bfc77f3a15137082b5c10af Mon Sep 17 00:00:00 2001
From: TEC <git@tecosaur.net>
Date: Wed, 31 Jul 2024 18:40:46 +0800
Subject: [PATCH] Check for underline term capability flag

A few terminals (Kitty) only set the Su cap not Smulx, we should
recognise either as sufficient for fancy underlines.
---
 src/io.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/io.jl b/src/io.jl
index 4e3a3bc..c2421d2 100644
--- a/src/io.jl
+++ b/src/io.jl
@@ -183,7 +183,8 @@ function termstyle(io::IO, face::Face, lastface::Face=getface())
     # Kitty fancy underlines, see <https://sw.kovidgoyal.net/kitty/underlines>
     # Supported in Kitty, VTE, iTerm2, Alacritty, and Wezterm.
     face.underline == lastface.underline ||
-        if haskey(Base.current_terminfo, :set_underline_style)
+        if haskey(Base.current_terminfo, :set_underline_style) ||
+           get(Base.current_terminfo, :can_style_underline, false)
             if face.underline isa Tuple # Color and style
                 color, style = face.underline
                 print(io, "\e[4:",