When 'split' is set to 'no', new buffer was created after quitted

[namutaka]

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

Problems summary

When split option is set to 'no', after I quitted ddu, new "No Name" buffer was created.

Expected

"No Name" buffer is not created.

Environment Information

• ddu-ui-filer version (SHA1): 61c76a14d04e3d3191c645e75a0e9400ce1252a4

• denops.vim version (SHA1): 8f3899de3d3add07105221262dca90a31c4c2d4c

• deno version(deno -V output): deno 1.32.2

• OS: Mac

• neovim/Vim :version output:

  NVIM v0.8.3
  Build type: Release
  LuaJIT 2.1.0-beta3

Provide a minimal init.vim/vimrc without plugin managers (Required!)

" Your minimal init.vim/vimrc
set runtimepath+=~/path/to/denops.vim
set runtimepath+=~/path/to/ddu.vim
set runtimepath+=~/path/to/ddu-source-file
set runtimepath+=~/path/to/ddu-ui-filer

nnoremap <space>e <Cmd>call ddu#start({
      \   'ui': 'filer',
      \   'sources': [{ 'name': 'file', 'params': {} }],
      \   'uiParams': {
      \     'filer': {
      \       'split': 'no',
      \     },
      \   },
      \ })<CR>

nnoremap <space>x <Cmd>call ddu#ui#filer#do_action('quit')<CR>

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

1. Open "No Name" buffer
2. Check buffer list (:ls)

   :ls
   1 %a   "[No Name]"                    line 1

3. Open ddu filer (<space>e)
4. Close ddu filer (<space>x)
5. Check buffer list again (:ls)

   :ls
   1  h   "[No Name]"                    line 1
   3 %a   "[No Name]"                    line 1

Screenshot (if possible)

Upload the log messages by :redir and :message (if errored)

[Shougo]

Fixed.