The prompt will be hidden.

[nabezokodaikon]

Warning: I will close the issue without the minimal init.vim and the
reproduction instructions.

Problems summary

<C-j> hides the prompt.

Expected

<C-j> does not hide the prompt.

Environment Information

• ddu.vim version (SHA1): 8a765f0

• denops.vim version (SHA1): e2f17041495123e8ed9baa69098c947c5d7f6358

• deno version(deno -V output): 1.18.2

• OS: Mac

• neovim/Vim :version output:

NVIM v0.7.0-dev+1017-g28d5face2
Build type: Release
LuaJIT 2.1.0-beta3

• :checkhealth or :CheckHealth result(neovim only): OK

Provide a minimal init.vim/vimrc with less than 50 lines (Required!)

if &compatible
    set nocompatible
endif

let $CACHE = expand('~/.cache')

if !isdirectory(expand($CACHE))
    call mkdir(expand($CACHE), 'p')
endif

let s:dein_dir = expand('$CACHE/dein')
let s:dein_repo_dir = s:dein_dir . '/repos/github.com/Shougo/dein.vim'

if &runtimepath !~# '/dein.vim'
    if !isdirectory(s:dein_repo_dir)
        execute '!git clone https://github.com/Shougo/dein.vim' s:dein_repo_dir
    endif
    execute 'set runtimepath^=' . s:dein_repo_dir
endif

call dein#begin(s:dein_dir, expand('<sfile>'))

call dein#add('vim-denops/denops.vim')
call dein#add('Shougo/ddu.vim')
call dein#add('Shougo/ddu-commands.vim')
call dein#add('Shougo/ddu-ui-std')
call dein#add('Shougo/ddu-filter-matcher_substring')
call dein#add('Shougo/ddu-source-file_rec')
call dein#add('Shougo/ddu-kind-file')

call dein#end()
call dein#save_state()

call ddu#custom#patch_global({
    \   'ui': 'std',
    \   'sourceOptions': {
    \     '_': {
    \       'matchers': ['matcher_substring'],
    \     },
    \   },
    \   'uiParams': {
    \     'std': {
    \       'split': 'floating',
    \       'prompt': '>'
    \     },
    \   },
    \ })

autocmd FileType ddu-std call s:ddu_my_settings()
function! s:ddu_my_settings() abort
  nnoremap <buffer><silent> <CR>
  \ <Cmd>call ddu#ui#std#do_action('itemAction')<CR>
  nnoremap <buffer><silent> i
  \ <Cmd>call ddu#ui#std#do_action('openFilterWindow')<CR>
  nnoremap <buffer><silent> q
  \ <Cmd>call ddu#ui#std#do_action('quit')<CR>
endfunction

autocmd FileType ddu-std-filter call s:ddu_filter_my_settings()
function! s:ddu_filter_my_settings() abort
  inoremap <buffer><silent> <CR>
  \ <Esc><Cmd>close<CR>
  nnoremap <buffer><silent> <CR>
  \ <Cmd>close<CR>
endfunction

How to reproduce the problem from neovim/Vim startup (Required!)

1. Start Neovim.
2. Run call dein#update() commnad.
3. Restart Neovim.
4. Run call ddu#start({'sources': [{'name': 'file_rec'}]}) command.
5. Type i (Open filter)
6. Type <C-j>

Screenshot (if possible)

[nabezokodaikon]

I'm sorry. This was an issue of ddu-ui-std.