Keymap normalization not compatible with <Leader> key

[cissoid]

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Minimal reproducible full config

if has('vim_starting')
  set encoding=utf-8
endif
scriptencoding utf-8

if &compatible
  set nocompatible
endif

let s:plug_dir = expand('/tmp/plugged/vim-plug')
if !filereadable(s:plug_dir .. '/plug.vim')
  execute printf('!curl -fLo %s/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim', s:plug_dir)
end

execute 'set runtimepath+=' . s:plug_dir
call plug#begin(s:plug_dir)
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/vim-vsnip'
Plug 'neovim/nvim-lspconfig'
call plug#end()
PlugInstall | quit

" Setup global configuration. More on configuration below.
lua << EOF
local cmp = require "cmp"
cmp.setup {
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },

  mapping = {
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
    ['<Leader>g<Space>'] = cmp.mapping.complete()
  },

  sources = cmp.config.sources({
    { name = "nvim_lsp" },
    { name = "buffer" },
  }),
}
EOF

lua << EOF
local capabilities = require('cmp_nvim_lsp').default_capabilities()

require'lspconfig'.cssls.setup {
  capabilities = capabilities,
}
EOF

Description

Add this config:

  mapping = {
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
    ['<Leader>g<Space>'] = cmp.mapping.complete()
  },

This keymap <Leader>g<Space> is not functioning properly, while it was working fine before.

Result with imap:

i  <*Leader>g<Space> * <Lua 24: /tmp/plugged/vim-plug/nvim-cmp/lua/cmp/utils/keymap.lua:133>
                 cmp.utils.keymap.set_map

Steps to reproduce

Included in reproducible config file.

Expected behavior

The keymap should worked.

Actual behavior

It not worked after upgrade cmp. Result in imap looks wired.

Additional context

No response

[phanen]

Not sure if is this a bug of vim/nvim:

let g:mapleader = "\<Space>"
map <Leader> <Cmd>echo "work"<CR>
map <*Leader> <Cmd>echo "not work"<CR>
map <Space> <Cmd>echo "work"<CR>
map <*Space> <Cmd>echo "work"<CR>

But here is a workaround:

'<Leader>g<Space>' -> (vim.g.mapleader or '\\') .. 'g<Space>'

[Shougo]

https://github.com/hrsh7th/nvim-cmp/pull/2073

Please test the latest version.

[cissoid]

#2073

Please test the latest version.

I tried the latest version, but the problem still persists. I guess this commit caused the issue: https://github.com/hrsh7th/nvim-cmp/commit/19bd8c7c9a834e31db1f15cb04635bf44219a7cb. It attempted to use <*xxx> to properly handle the modifier key, but <Leader> is not a terminal keycode.

The workaround solution is working well, thanks for your help!