Netrw: CTRL-^ does not work with g:netrw_liststyle=3

[saccarosium]

Problem

When having netrw's treeview enabled, it is not possible to use CTRL-^ to switch back and forth between a selected file and netrw -- the netrw window will show an empty buffer named "NetrwTreeListing" -- no files are visible.

Steps to reproduce

1. create otherwise empty init.vim containing only

   let g:netrw_liststyle=3

2. open nvim
3. :Ex
4. select and open file
5. try CTRL-^

Expected behavior

You should see the previous netrw listing, but you'll be seeing an empty one instead.

Neovim version (nvim -v)

v0.9.5

Vim (not Nvim) behaves the same?

yes

Operating system/version

Debian

Terminal name/version

gnome-terminal

$TERM environment variable

xterm-256color

Installation

aptitude

original issue: neovim/neovim#29620