Curly/colored underlines not working on windows

[chtenb]

Summary

Enabling a test theme with many curly underlines yields this result
cmd.exe:
wezterm:

However, both terminal emulators do support curly underlines.
cmd.exe:

wezterm:

Reproduction Steps

I tried this:

1. Configure a theme with curly underlines, "ui.text" = { underline = { color = "light-green", style = "curl" } }
2. Open a text file in hx and observe

I expected this to happen:
Green curly underlines

Instead, this happened:
straight colorless underlines

Helix log

No relevant log lines

Platform

Windows 11

Terminal Emulator

Latest wezterm and cmd.exe

Installation Method

source

Helix Version

24.03-21-g55c12d90

[pascalkuthe]

Detecting support on windows automatically is hard since there is no terminfo.

You.nerd to manually enable the config option

[kirawi]

Edit: Ah nevermind, it never goes through the branch if there's no terminfo to begin with.

Shouldn't Wezterm have undercurls regardless because of

helix/helix-tui/src/backend/crossterm.rs

Lines 63 to 76 in 97afd67

	Ok(t) => Capabilities {
	// Smulx, VTE: https://unix.stackexchange.com/a/696253/246284
	// Su (used by kitty): https://sw.kovidgoyal.net/kitty/underlines
	// WezTerm supports underlines but a lot of distros don't properly install it's terminfo
	has_extended_underlines: config.undercurl
	|| t.extended_cap("Smulx").is_some()
	|| t.extended_cap("Su").is_some()
	|| vte_version() >= Some(5102)
	|| matches!(term_program().as_deref(), Some("WezTerm")),
	reset_cursor_command: t
	.utf8_string_cap(termini::StringCapability::CursorNormal)
	.unwrap_or("\x1B[0 q")
	.to_string(),
	},

?