fix(#2945): stack overflow on api.git.reload or fugitive event with watchers disabled (#2949)

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

This reverts commit 50e919426a.

* fix(#2945): stack overflow on api.git.reload or fugitive event

lua/nvim-tree/utils.lua

@@ -112,8 +112,7 @@ function M.find_node(nodes, fn)
     end)
     :iterate()
   i = require("nvim-tree.view").is_root_folder_visible() and i or i - 1
-  local explorer = require("nvim-tree.core").get_explorer()
-  if explorer and explorer.live_filter.filter then
+  if node and node.explorer.live_filter.filter then
     i = i + 1
   end
   return node, i
@@ -121,7 +120,7 @@ end
 
 -- Find the line number of a node.
 -- Return -1 is node is nil or not found.
----@param node Node|nil
+---@param node Node?
 ---@return integer
 function M.find_node_line(node)
   if not node then
@@ -174,16 +173,6 @@ function M.get_node_from_path(path)
     :iterate()
 end
 
----Get the highest parent of grouped nodes
----@param node Node
----@return Node node or parent
-function M.get_parent_of_group(node)
-  while node and node.parent and node.parent.group_next do
-    node = node.parent
-  end
-  return node
-end
-
 M.default_format_hidden_count = function(hidden_count, simple)
   local parts = {}
   local total_count = 0
@@ -473,7 +462,7 @@ end
 ---Focus node passed as parameter if visible, otherwise focus first visible parent.
 ---If none of the parents is visible focus root.
 ---If node is nil do nothing.
----@param node Node|nil node to focus
+---@param node Node? node to focus
 function M.focus_node_or_parent(node)
   local explorer = require("nvim-tree.core").get_explorer()
 
@@ -549,14 +538,6 @@ function M.array_remove_nils(array)
   end, array)
 end
 
----@param f fun(node: Node|nil)
----@return function
-function M.inject_node(f)
-  return function()
-    f(require("nvim-tree.lib").get_node_at_cursor())
-  end
-end
-
 --- Is the buffer named NvimTree_[0-9]+ a tree? filetype is "NvimTree" or not readable file.
 --- This is cheap, as the readable test should only ever be needed when resuming a vim session.
 ---@param bufnr number|nil may be 0 or nil for current
@@ -578,4 +559,16 @@ function M.is_nvim_tree_buf(bufnr)
   return false
 end
 
+--- path is an executable file or directory
+---@param absolute_path string
+---@return boolean
+function M.is_executable(absolute_path)
+  if M.is_windows or M.is_wsl then
+    --- executable detection on windows is buggy and not performant hence it is disabled
+    return false
+  else
+    return vim.loop.fs_access(absolute_path, "X") or false
+  end
+end
+
 return M