[bug] conflict with peekaboo

[Freed-Wu]

" $ uname -r
" 5.13.10-arch1-1
" $ has nvim
" ✓ nvim 0.5.0
" $ has python
" ✓ python 3.9.6
" $ cat test.vim
set runtimepath=$VIMRUNTIME
set runtimepath+=~/.local/share/nvim/repos/github.com/mhinz/vim-startify
set runtimepath+=~/.local/share/nvim/repos/github.com/junegunn/vim-peekaboo
" $ vi -u test.vim

Press "

Press <Esc>

In the right of window, there exists a new window.

However, if vi -u test.vim a, the window will not exist.