jQuery backport causes downstream JS errors

Problem/Motivation

The security update backport to the jQuery UI position function is causing JS errors downstream in contrib modules that call the position function without any options. See #3259436: JS error after core 7.86 update for background.

Steps to reproduce

• Install a Drupal 7.86 site with the jQuery Update and contrib Linkit modules enabled.
• Set jQuery Update to use version 1.10.
• Enable Linkit on a link field.
• Activate the Linkit button when editing the field.
• Note the Search for content field doesn't do anything.

Console stack trace:

jquery.ui.position-1.13.0-backport.js?v=1.10.2:21 Uncaught TypeError: Cannot read properties of undefined (reading 'of')
    at $.fn.init.position (jquery.ui.position-1.13.0-backport.js?v=1.10.2:21:35)
    at Object.insertSuggestionList (linkit.dashboard.js?v=7.3:207:28)
    at new BetterAutocomplete (jquery.better-autocomplete.js?v=1.0:187:15)
    at HTMLInputElement.init (jquery.better-autocomplete.js?v=1.0:109:19)
    at HTMLInputElement.<anonymous> (jquery.better-autocomplete.js?v=1.0:128:27)
    at Function.each (jquery.min.js?v=1.10.2:4:5347)
    at $.fn.init.each (jquery.min.js?v=1.10.2:4:1999)
    at $.fn.init.$.fn.betterAutocomplete (jquery.better-autocomplete.js?v=1.0:125:10)
    at HTMLInputElement.<anonymous> (linkit.dashboard.js?v=7.3:240:21)
    at Function.each (jquery.min.js?v=1.10.2:4:5347)

Linkit calls the position function without any options:

var top = $input.position().top + $input.outerHeight() - 5;

Which seems to be allowed, see https://api.jquery.com/position/ and https://api.jqueryui.com/position/. But the core backport expects that there will be options:

var target = typeof options.of === "string" ?
        $(document).find(options.of) :
        $(options.of);

which causes "Cannot read properties of undefined" because there is no options object to act on.

Proposed resolution

Patch the backport so that it can handle being called without options.

Remaining tasks

Patch and test.

User interface changes

None.

API changes

None.

Data model changes

None.

Release notes snippet

TBD