Lines starting with `--` are not highlighted when called by `git commit -v`

[sshilovsky]

Summary

When a line starting with - is removed from a source file, the corresponding diff line starts with double -.

It's not highlighted in the editor.

Reproduction Steps

$ cd $(mktemp -d)
$ git init
$ echo "-1" > a
$ git add a
$ git commit a -m1
$ truncate --size 0 a
$ GIT_EDITOR=$(which hx) git commit a -v

The following content is opened:

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# On branch main
# Changes to be committed:
#	modified:   a
#
# ------------------------ >8 ------------------------
# Do not modify or remove the line above.
# Everything below it will be ignored.
diff --git a/a b/a
index 3a2e3f4..e69de29 100644
--- a/a
+++ b/a
@@ -1 +0,0 @@
--1

The last line (--1) designates a removed line, and should be highlighted (usually with red font), but it's not. It doesn't have to be the last line for this to happen.

Helix log

~/.cache/helix/helix.log

2022-09-05T02:07:10.096 helix_view::editor [ERROR] Failed to initialize the LSP for `git.commitmsg` { LSP not defined }

Platform

Linux

Terminal Emulator

alacritty 0.10.1 ()

Helix Version

helix 22.08 (ee94031)