Neogit/syntax and hl.lua changes result in highlight regression

[wroyca]

Description

The recent modifications made in 448f660 accidentally broke Neogit's highlights, often resulting in incorrect highlights or, if you are to change colorscheme, no highlights appearing at all

See also echasnovski/mini.nvim#388

Neovim version

NVIM v0.9.1
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3

Operating system and version

Fedora 38

Steps to reproduce

1. Select any commit to open the commit-view
2. Look at signs highlights
3. Change colorscheme from cmdline

Expected behavior

Actual behavior

Minimal config

vim.cmd([[set runtimepath=$VIMRUNTIME]])
vim.cmd([[set packpath=/tmp/nvim/site]])
local package_root = "/tmp/nvim/site/pack"
local install_path = package_root .. "/packer/start/packer.nvim"
local function load_plugins()
  require("packer").startup({
    {
      "wbthomason/packer.nvim",
      {
        "TimUntersberger/neogit",
        requires = {
          { "nvim-lua/plenary.nvim" },
          { "sindrets/diffview.nvim" },
        },
        config = function()
          print("loaded neogit")
          require("neogit").setup()
        end,
      },
    },
    config = {
      package_root = package_root,
      compile_path = install_path .. "/plugin/packer_compiled.lua",
      display = { non_interactive = true },
    },
  })
end
if vim.fn.isdirectory(install_path) == 0 then
  print("Installing neogit and dependencies.")
  vim.fn.system({ "git", "clone", "--depth=1", "https://github.com/wbthomason/packer.nvim", install_path })
end
load_plugins()
require("packer").sync()

[wroyca]

Should be properly handled with NeogitOrg#617