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

This reverts commit 38aac09151.

lua/nvim-tree/node/link.lua

@@ -1,89 +0,0 @@
-local watch = require("nvim-tree.explorer.watch")
-
-local BaseNode = require("nvim-tree.node")
-
----@class (exact) LinkNode: BaseNode
----@field has_children boolean
----@field group_next Node? -- If node is grouped, this points to the next child dir/link node
----@field link_to string absolute path
----@field nodes Node[]
----@field open boolean
-local LinkNode = BaseNode:new()
-
----Static factory method
----@param explorer Explorer
----@param parent Node
----@param absolute_path string
----@param name string
----@param fs_stat uv.fs_stat.result?
----@return LinkNode? nil on vim.loop.fs_realpath failure
-function LinkNode:create(explorer, parent, absolute_path, name, fs_stat)
-  -- INFO: sometimes fs_realpath returns nil
-  -- I expect this be a bug in glibc, because it fails to retrieve the path for some
-  -- links (for instance libr2.so in /usr/lib) and thus even with a C program realpath fails
-  -- when it has no real reason to. Maybe there is a reason, but errno is definitely wrong.
-  local link_to = vim.loop.fs_realpath(absolute_path)
-  if not link_to then
-    return nil
-  end
-
-  local open, nodes, has_children
-  local is_dir_link = (link_to ~= nil) and vim.loop.fs_stat(link_to).type == "directory"
-
-  if is_dir_link and link_to then
-    local handle = vim.loop.fs_scandir(link_to)
-    has_children = handle and vim.loop.fs_scandir_next(handle) ~= nil or false
-    open = false
-    nodes = {}
-  end
-
-  ---@type LinkNode
-  local o = {
-    type = "link",
-    explorer = explorer,
-    absolute_path = absolute_path,
-    executable = false,
-    fs_stat = fs_stat,
-    hidden = false,
-    is_dot = false,
-    name = name,
-    parent = parent,
-    watcher = nil,
-    diag_status = nil,
-
-    has_children = has_children,
-    group_next = nil,
-    link_to = link_to,
-    nodes = nodes,
-    open = open,
-  }
-  o = self:new(o) --[[@as LinkNode]]
-
-  if is_dir_link then
-    o.watcher = watch.create_watcher(o)
-  end
-
-  return o
-end
-
----Create a sanitized partial copy of a node, populating children recursively.
----@return LinkNode cloned
-function LinkNode:clone()
-  local clone = BaseNode.clone(self) --[[@as LinkNode]]
-
-  clone.has_children = self.has_children
-  clone.group_next = nil
-  clone.link_to = self.link_to
-  clone.nodes = {}
-  clone.open = self.open
-
-  if self.nodes then
-    for _, child in ipairs(self.nodes) do
-      table.insert(clone.nodes, child:clone())
-    end
-  end
-
-  return clone
-end
-
-return LinkNode