fix init_tree should not run when root path doesnt change

lua/lib/state.lua

@@ -11,6 +11,10 @@ function M.set_root_path(path)
   ROOT_PATH = path
 end
 
+function M.get_root_path()
+  return ROOT_PATH
+end
+
 local Tree = {}
 
 local IGNORE_LIST = ""

lua/tree.lua

@@ -158,6 +158,9 @@ function M.navigate_to_buffer_dir(bufname)
   if new_path ~= '/' then
     new_path = new_path .. '/'
   end
+  if new_path == state.get_root_path() then
+    return
+  end
   set_root_path(new_path)
   init_tree()
 end