CocList fallbacks either insert a redundant 'i' or leave vim in insert mode

[Frederick888]

Environment

• echo $FZF_DEFAULT_OPTS: (null)
• bat --version: 0.18.0
• Are your vim plugins up-to-date?: Yes
• (n)vim --version:

  
  NVIM v0.4.4
  Build type: Release
  LuaJIT 2.1.0-beta3
  Compilation: /usr/bin/clang -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/tmp/neovim-20210210-5325-1nkdpus/neovim-0.4.4/build/config -I/tmp/neovim-20210210-5325-1nkdpus/neovim-0.4.4/src -I/usr/local/include -I/usr/local/opt/luv/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/usr/local/opt/gettext/include -I/tmp/neovim-20210210-5325-1nkdpus/neovim-0.4.4/build/src/nvim/auto -I/tmp/neovim-20210210-5325-1nkdpus/neovim-0.4.4/build/include
  Compiled by brew@BigSur

Features: +acl +iconv +tui See ":help feature-compile"

system vimrc file: "$VIM/sysinit.vim" fall-back for $VIM: "/usr/local/Cellar/neovim/0.4.4_1/share/nvim"

Run :checkhealth for more info

# Describe the Bug
Some lists at the moment redirects to CoC's built-in `CocList`.

If I use such a list from `CocFzfList` (without arguments, then choose from the pop-up), either a redundant `i` is inserted into the fuzzy search bar, or after Esc it leaves vim in insert mode.

# To Reproduce
## **Minimal** vimrc
```vim
set runtimepath^=~/.vim runtimepath+=~/.vim/after
let &packpath = &runtimepath

" vim-plug
call plug#begin()

Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'junegunn/fzf'
Plug 'junegunn/fzf.vim'
Plug 'antoinemadec/coc-fzf', { 'branch': 'release' }

call plug#end()

Steps to Reproduce

1. nvim -u minimal_vimrc
2. :CocFzfList
3. Choose a list like folders

Expected Behavior

No redundant i and after ESC Vim should be in normal mode.

---

Commenting out https://github.com/antoinemadec/coc-fzf/blob/3c8ca6127af51768cad8ff1074db5a9713d7fe13/autoload/coc_fzf/lists.vim#L70 seems to fix the problem for me. Now both lists with native coc-fzf support (e.g. commands) and non-natives (e.g. folders) work normally. Not sure if this is the root reason though.

[antoinemadec]

Fzf has changed recently and it is probable that the enter_term_mode() hack is not needed anymore on neovim 0.4.4.

I will remove it in the next few days.