refactor(#2886): multi instance: node class refactoring: extract links, *_git_status (#2944)

* extract DirectoryLinkNode and FileLinkNode, move Node methods to children

* temporarily move DirectoryNode methods into BaseNode for easier reviewing

* move mostly unchanged DirectoryNode methods back to BaseNode

* tidy

* git.git_status_file takes an array

* update git status of links

* luacheck hack

lua/nvim-tree/git/init.lua

@@ -283,33 +283,46 @@ function M.load_project_status(path)
   end
 end
 
+---Git file and directory status for an absolute path with optional file fallback
 ---@param parent_ignored boolean
 ---@param status table|nil
----@param absolute_path string
+---@param path string
+---@param path_file string? alternative file path when no other file status
 ---@return GitStatus|nil
-function M.git_status_dir(parent_ignored, status, absolute_path)
+function M.git_status_dir(parent_ignored, status, path, path_file)
   if parent_ignored then
     return { file = "!!" }
   end
 
   if status then
     return {
-      file = status.files and status.files[absolute_path],
+      file = status.files and status.files[path] or path_file and status.files[path_file],
       dir = status.dirs and {
-        direct = status.dirs.direct[absolute_path],
-        indirect = status.dirs.indirect[absolute_path],
+        direct = status.dirs.direct[path],
+        indirect = status.dirs.indirect[path],
       },
     }
   end
 end
 
+---Git file status for an absolute path with optional fallback
 ---@param parent_ignored boolean
 ---@param status table|nil
----@param absolute_path string
+---@param path string
+---@param path_fallback string?
 ---@return GitStatus
-function M.git_status_file(parent_ignored, status, absolute_path)
-  local file_status = parent_ignored and "!!" or (status and status.files and status.files[absolute_path])
-  return { file = file_status }
+function M.git_status_file(parent_ignored, status, path, path_fallback)
+  if parent_ignored then
+    return { file = "!!" }
+  end
+
+  if not status or not status.files then
+    return {}
+  end
+
+  return {
+    file = status.files[path] or status.files[path_fallback]
+  }
 end
 
 function M.purge_state()