Revert "refactor(#2871, #2886): multi instance: node classes created (#2916)"

This reverts commit 38aac09151.

lua/nvim-tree/actions/moves/item.lua

@@ -2,6 +2,7 @@ local utils = require("nvim-tree.utils")
 local view = require("nvim-tree.view")
 local core = require("nvim-tree.core")
 local lib = require("nvim-tree.lib")
+local explorer_node = require("nvim-tree.explorer.node")
 local diagnostics = require("nvim-tree.diagnostics")
 
 local M = {}
@@ -15,7 +16,7 @@ local MAX_DEPTH = 100
 ---@return boolean
 local function status_is_valid(node, what, skip_gitignored)
   if what == "git" then
-    local git_status = node:get_git_status()
+    local git_status = explorer_node.get_git_status(node)
     return git_status ~= nil and (not skip_gitignored or git_status[1] ~= "!!")
   elseif what == "diag" then
     local diag_status = diagnostics.get_diag_status(node)
@@ -74,7 +75,7 @@ local function expand_node(node)
   if not node.open then
     -- Expand the node.
     -- Should never collapse since we checked open.
-    node:expand_or_collapse()
+    lib.expand_or_collapse(node)
   end
 end
 
@@ -97,7 +98,7 @@ local function move_next_recursive(what, skip_gitignored)
     valid = status_is_valid(node_init, what, skip_gitignored)
   end
   if node_init.nodes ~= nil and valid and not node_init.open then
-    node_init:expand_or_collapse()
+    lib.expand_or_collapse(node_init)
   end
 
   move("next", what, skip_gitignored)

lua/nvim-tree/actions/moves/parent.lua

@@ -1,6 +1,7 @@
 local view = require("nvim-tree.view")
 local utils = require("nvim-tree.utils")
 local core = require("nvim-tree.core")
+local lib = require("nvim-tree.lib")
 
 local M = {}
 
@@ -11,7 +12,7 @@ function M.fn(should_close)
 
   return function(node)
     local explorer = core.get_explorer()
-    node = node:last_group_node()
+    node = lib.get_last_group_node(node)
     if should_close and node.open then
       node.open = false
       if explorer then
@@ -20,7 +21,7 @@ function M.fn(should_close)
       return
     end
 
-    local parent = node:get_parent_of_group().parent
+    local parent = utils.get_parent_of_group(node).parent
 
     if not parent or not parent.parent then
       return view.set_cursor({ 1, 0 })

lua/nvim-tree/actions/moves/sibling.lua

@@ -15,7 +15,7 @@ function M.fn(direction)
     local first, last, next, prev = nil, nil, nil, nil
     local found = false
     local parent = node.parent or core.get_explorer()
-    Iterator.builder(parent and parent.nodes or {})
+    Iterator.builder(parent.nodes)
       :recursor(function()
         return nil
       end)