Defx works not so well with Recover.vim

Problems summary

Run :call execute("Defx -auto-cd -search=".fnameescape(expand('%:p'))." ".expand("~")) when enable plugin https://github.com/chrisbra/recover.vim will get some unexpected results:

1. defx shows in current window instead of a new split
2. something happend let other autocmd not work

Expected

Fix listed results above, which means have same behavior as https://github.com/chrisbra/recover.vim disabled.

Environment Information

• plugin version(SHA1): e1842ae
• OS: Linux
• neovim/Vim version: gvim 8.2.2815-1

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

let mapleader=" "

call plug#begin('~/.vim/plugged')
if has('nvim')
  Plug 'Shougo/defx.nvim', { 'do': ':UpdateRemotePlugins' }
else
  Plug 'Shougo/defx.nvim'
  Plug 'roxma/nvim-yarp'
  Plug 'roxma/vim-hug-neovim-rpc'
endif
Plug 'chrisbra/recover.vim'
Plug 'ntpeters/vim-better-whitespace'
call plug#end()

augroup vimrc_defx
  autocmd!
  autocmd VimEnter * call Setup_Defx()
augroup END

nnoremap <silent><leader>l :call execute("Defx -auto-cd -search=".fnameescape(expand('%:p'))." ".expand("~"))<CR>

function! Setup_Defx() abort
  silent! call defx#custom#option('_', {
        \ 'winwidth': 30,
        \ 'split': 'vertical',
        \ 'direction': 'topleft',
        \ 'show_ignored_files': 0,
        \ 'buffer_name': 'defxplorer',
        \ 'columns': 'indent:filename',
        \ 'toggle': 1,
        \ 'resume': 1,
        \ 'listed': 1,
        \ 'root_marker': '≡ '
        \ })
  silent! call defx#custom#column('filename', {
        \ 'max_width': 80,
        \ })
endfunction

let g:better_whitespace_enabled=1
let g:better_whitespace_filetypes_blacklist=['defx']

The reproduce ways from Vim starting (Required!)

Use Vim open a file A and then press <leader>l.

Compare results of press <leader>l in Normal mode between enable and disable https://github.com/chrisbra/recover.vim .

What we can find:

https://github.com/chrisbra/recover.vim enabled

1. defx covers buffer of A
2. the trailing spaces of defx are highlight by https://github.com/ntpeters/vim-better-whitespace, which means the autocmd set by https://github.com/ntpeters/vim-better-whitespace not run after open defx

https://github.com/chrisbra/recover.vim disabled

1. defx opens in a new split
2. the trailing spaces of defx not hightlight

Screen shot (if possible)

when enable Recover.vim:

when disable Recover.vim:

[chrisbra]

I just pushed a fix, I think.

[roachsinai]

@Shougo Thanks!