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something wrong when repeating opening one file using LeaderfFile

See original GitHub issue

vim or neovim?
- vim
- neovim

Output of vim --version or nvim --version:

VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Mar 18 2020 18:29:15)

Output of :echo has("python"):
```
0
```
Output of :echo has("python3"):
```
1
```
Output of :echo &pythondll(only vim, not neovim): Nothing
Output of :echo &pythonthreedll(only vim, not neovim): Nothing

Output of :py print(sys.version):

E319: Sorry, the command is not available in this version

Output of :py3 print(sys.version):

3.6.9 (default, Jul 17 2020, 12:50:27)
[GCC 8.4.0]

Output of :echo g:Lf_Debug_Cmd:
Output of :echo g:Lf_FilesFromCache:
Operating system:
- Linux
- Mac OS X
- Windows
- Etc.

Configurations related to LeaderF in vimrc:

" LeaderF
nnoremap <leader>f :LeaderfFile .<cr>
let g:Lf_WildIgnore = {
            \ 'dir': ['.svn','.git','.hg','.vscode','.wine','.deepinwine','.oh-my-zsh'],
            \ 'file': ['*.sw?','~$*','*.bak','*.exe','*.o','*.so','*.py[co]']
            \}
let g:Lf_UseCache = 0

Describe your question, feature request, or bug.

When re-open the file which has opened using LeaderfFile, it will show:

File "/root/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/fileExpl.py", line 855, in _acceptSelection^@    lfDrop('', file)^@  File "/root/.vim/plugged/LeaderF/autoload/leaderf/python/l
eaderf/utils.py", line 194, in lfDrop^@    lfCmd("keepj hide drop %s" % escSpecial(file_name))^@vim.error: Vim(drop):E319: Sorry, the command is not available in this version: keepj hide drop
/root/work/codes/oneflow/oneflow/user/ops/relu_op.cpp

Steps to reproduce

Re-open the file which has opened in the vim using LeaderfFile.

Actual behaviour

Show the info:

File "/root/.vim/plugged/LeaderF/autoload/leaderf/python/leaderf/fileExpl.py", line 855, in _acceptSelection^@    lfDrop('', file)^@  File "/root/.vim/plugged/LeaderF/autoload/leaderf/python/l
eaderf/utils.py", line 194, in lfDrop^@    lfCmd("keepj hide drop %s" % escSpecial(file_name))^@vim.error: Vim(drop):E319: Sorry, the command is not available in this version: keepj hide drop
/root/work/codes/oneflow/oneflow/user/ops/relu_op.cpp