[Question] How do I customize the commands that popup executes in normal mode?

[tamago324]

• vim or neovim?
  • [x] vim
  • [ ] neovim
• Output of vim --version or nvim --version:

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Jan 21 2020 23:11:36)
MS-Windows 32-bit GUI version with OLE support
Included patches: 1-140
Compiled by appveyor@APPVYR-WIN

• Output of :echo has("python"):
• Output of :echo has("python3"): 1
• Output of :echo &pythondll(only vim, not neovim):
• Output of :echo &pythonthreedll(only vim, not neovim):
• Output of :py print(sys.version):
• Output of :py3 print(sys.version): 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 22:39:24) [MSC v.1916 32 bit (Intel)]
• Output of :echo g:Lf_Debug_Cmd:
• Output of :echo g:Lf_FilesFromCache:
• Operating system:
  • [ ] Linux
  • [ ] Mac OS X
  • [x] Windows
  • [ ] Etc.
• Configurations related to LeaderF in vimrc:

set encoding=utf-8
scriptencoding utf-8

syntax enable
filetype plugin indent on

set nocompatible

set runtimepath=~/ghq/github.com/Yggdroot/LeaderF

" no backup
set nobackup
set nowritebackup

" no swap
set noswapfile
set updatecount=0

nnoremap <silent> <Space>q :<C-u>quit<CR>
nnoremap <silent> <Space>Q :<C-u>quit!<CR>

let g:Lf_NormalMap = {
\   '_': [
\      ['<C-j>', 'j'],
\      ['<C-k>', 'k'],
\      ['K',     '<Nop>'],
\      ['M',     '<Nop>'],
\      ['E',     ':echo '],
\   ],
\   'File': [
\      ['M', ':exec g:Lf_py "fileExplManager.quit()" <bar> :LeaderfMru<CR>'],
\   ],
\}

colorscheme morning

Describe your question, feature request, or bug.

The above vimrc with g:Lf_NormalMap did not execute the command in normal mode for popup.

Is there any solution?

Steps to reproduce

1. gvim.exe -N -u min_vimrc -U NONE -i NONE
2. :Leaderf! file --popup
3. M (I want LeaderfMru to open.)

Actual behaviour

The normal mode commands cannot be customized in popup mode.

Expected behaviour

I want to be able to execute commands in popup normal mode, using options such as g:Lf_NormalMap

Thank you!