git plugin: nvim_get_hl must not be called in a lua loop callback.

[sax]

Describe the bug

After updating to the latest neovim and kyazdani42/nvim-web-devicons I get the following error from sidebar's git plugin, when I have an untracked file with an extension:

Error executing luv callback:
...packer/start/nvim-web-devicons/lua/nvim-web-devicons.lua:144: E5560: nvim_get_hl must not be called in a lua loop callback
stack traceback:
        [C]: in function 'nvim_get_hl'
        ...packer/start/nvim-web-devicons/lua/nvim-web-devicons.lua:144: in function 'highlight_exists'
        ...packer/start/nvim-web-devicons/lua/nvim-web-devicons.lua:387: in function 'get_icon_colors'
        ...packer/start/nvim-web-devicons/lua/nvim-web-devicons.lua:401: in function 'get_icon_color'
        ...cker/start/sidebar.nvim/lua/sidebar-nvim/builtin/git.lua:80: in function 'parse_fn'
        ...cker/start/sidebar.nvim/lua/sidebar-nvim/builtin/git.lua:132: in function <...cker/start/sidebar.nvim/lua/sidebar-nvim/builtin/git.lua:125>

To Reproduce
Steps to reproduce the behavior:

1. mkdir -p /tmp/sandbox
2. cd /tmp/sandbox
3. git init
4. touch file.exs, or touch file.rs
5. nvim .
6. See error

Environment:

• nvim --version

  NVIM v0.10.4
  Build type: Release
  LuaJIT 2.1.1736781742
  

• sidebar setup

require'nvim-web-devicons'.setup()

local sidebar = require("sidebar-nvim")
local opts = {
  diagnostics = {
  },
  git = {
  },
  files = {
    show_hidden = true,
    ignored_paths = { "%.git$", "%.elixir_ls$", "%.iex-history$" }
  },
  open = false,
  sections = { "git", "diagnostics", "files", "symbols" },
  section_separator = { "_________________", "" },
  symbols = {
  }
}
sidebar.setup(opts)

vim.api.nvim_set_keymap("n", "<leader><tab>", ":SidebarNvimToggle<CR>", { noremap = true})

• dotfiles: https://github.com/sax/dotfiles

[sax]

I pinned nvim-web-devicons to a specific sha to avoid the issue: 37334ad.

I would be happy to contribute to a fix, but my facility in Lua is pretty lacking. I think I would need guidance towards the most appropriate fix.