Calling :LuaTreeToggle creates empty buffers when "hidden" is set

[nanotee]

OS: Ubuntu 18.04
terminal: Gnome Terminal
nvim: NVIM v0.5.0-392-gff1730373

Steps to reproduce using nvim -u NORC

In any buffer, set the following option:

:set hidden

Then, call :LuaTreeToggle a few times. When inspecting the buffer list, this is the result:

:buffers                                                                                   
  1 %a   "[No Name]"                    line 1
  4  h   "[No Name]"                    line 1
  6  h   "[No Name]"                    line 1
  8  h   "[No Name]"                    line 1
 10  h   "[No Name]"                    line 1
Press ENTER or type command to continue

---

After investigating the issue a bit, it seems to come from this line:
https://github.com/kyazdani42/nvim-tree.lua/blob/7e3ff3db86effd9901448ff8d553af71526e979a/lua/lib/winutils.lua#L69

According to the documentation, :new opens a new window with an empty file in it, hence why the buffer isn't discarded. Using :vsplit instead seems to fix the bug, but I'm not familiar enough with (Neo)vim's quirks to know whether this causes other undesirable side effects.

Thanks for the cool plugin by the way, it has nice defaults and works really well out of the box :)

[kyazdani42]

I'm glad you like it !
indeed, i think i didn't read this part carefully. I haven't even noticed this bug which seems pretty obvious to me though...
It happened because with vnew i create a file in the window, which i replace with the buffer for the tree. So vsplit fixes it because no file is set by default in the window and i can assign the buffer normally.
Thanks for the debug though, saved me some time.