The selectmenuselect event erroneously fires, despite not making a selection

This is the same exact bug from 2017 which was filed at https://bugs.jqueryui.com/ticket/15115/#comment:1

The comment is more accurate than the OP's post.

The OP gives an example at http://jsbin.com/cubulifice/edit?html,js,console,output

If you open the dropdown menu, then click outside of the dropdown to close it, and rinse and repeat a few times - the event fires, even though nothing was selected.

This can be fixed by inserting this code after function() { :

if($('#speed-menu .ui-menu-item').is(':hidden')) {
  console.log('Ignoring erroneous selection');
  return;
}

Similarly, here is my own example: https://jsfiddle.net/eucq05ok/

In my own tests, it is easier to reproduce the bug if you hover over some of the options before clicking outside of the dropdown.

This can be fixed by inserting the same code, but changing #speed-menu to #area-menu.

I observed this bug on the latest version of jQuery (3.7.1) and the latest version of jQuery UI (1.14.1).

Reproduce the event using the linked jsbin or jsfiddle, including hovering options before clicking outside the dropdown, and compare the behavior with the historical ticket. Trace the selectmenuselect event entry point and add regression coverage showing that closing without a selection does not fire it; verify that genuine selections still do.