fix: opening multiple current neo-tree windows

When opening a new neo-tree window with the `current` position, do not
close all other `current` windows.
This allows having multiple `current` windows side-by-side on the same
tabpage.

It was possible before with the following combination (open neo-tree in
one buffer, then split it):
:e .<CR>:vs

This opened two neo-tree windows side-by-side (when
`hijack_netrw_behavior` was set to `open_current`).

However, when trying
to it the other way around (open two buffers side by side, open neo-tree
in one of them, then switch to the other buffer and open neo-tree in
that one):
:vs<CR>:Neotree position=current<CR><C-W>p:Neotree position=current

Opening the second neo-tree window closed the first one.

With this fix, both combinations lead to the same result of having two
independent neo-tree windows side-by-side with the `current` position.

Author: Gelio

lua/neo-tree/command/init.lua

@@ -146,7 +146,9 @@ do_show_or_focus = function(args, state, force_navigate)
     if not window_exists then
       -- Clear the space in case another source is already open
       local target_position = args.position or state.current_position or state.window.position
-      manager.close_all(target_position)
+      if target_position ~= "current" then
+        manager.close_all(target_position)
+      end
     end
   end