fix(open-file): focus file if already opened

lua/nvim-tree/utils.lua

@@ -335,14 +335,14 @@ function M.focus_file(path)
   require("nvim-tree.view").set_cursor { i + 1, 1 }
 end
 
-function M.is_in_displayed_buffer(path)
+function M.get_win_buf_from_path(path)
   for _, w in pairs(vim.api.nvim_tabpage_list_wins(0)) do
     local b = vim.api.nvim_win_get_buf(w)
     if vim.api.nvim_buf_get_name(b) == path then
-      return true
+      return w, b
     end
   end
-  return false
+  return nil, nil
 end
 
 return M