* Revert "make completion popup windows have bufhidden=wipe (#886)"
This reverts commit f573479528.
* Remove redundant nvim_buf_set_option
`buftype=nofile` and `bufhidden=hide` are already set by
`nvim_create_buf(false, true)`.
* Revert "make completion popup windows have bufhidden=wipe (#886)"
This reverts commit f573479528.
* Remove redundant nvim_buf_set_option
`buftype=nofile` and `bufhidden=hide` are already set by
`nvim_create_buf(false, true)`.