Excessive "Access denied" logs from Ajax during automatic user logout.

Problem/Motivation

After the user logs out, the JS autologoutGetTimeLeft() function is being called multiple times, generating an excessive amount of logs in the database log (dblog), which is significantly increasing the size of the dblog table when you have lots of users.

Steps to reproduce

1. Set the automatic logout timeout to 1 minute;
2. Clear the Drupal cache;
3. Log in and wait wait until you are automatically logged out by the autologout module;
5. Check the dblog (See the attached image).

Expected Behavior

We expect that the autologoutGetTimeLeft function will not be called multiple times if the user is already logged out, in order to avoid "access denied" logs.

Proposed resolution

I suggest adding the following code to the autologoutGetTimeLeft function in JavaScript. This modification worked for me:

js/autologout.hs

Drupal.Ajax.prototype.autologoutGetTimeLeft = function (callback) {
  let ajax = this;

  // If an AJAX request is currently running, don't run this one.
  // This prevents multiple AJAX requests from running at the same time.
  if (ajax.ajaxing) {
    return false;
  }

  // If there is no user, don't make an AJAX request and just redirect.
  if (typeof drupalSettings.user === 'undefined') {
    return false;
   }

  (...)