What is the problem?

When using the MenuTagMultiselectWidget, the tab key selects options that are highlighted in the dropdown.

This means if I am tabbing through form fields I can unintentionally select/deselect an option.

Where the dropdown shows the existing tags (like in the screenshot), I cannot find a way of tabbing past the widget without adding or removing a tag.

This makes it hard to use the form only with your keyboard.

EDIT I have worked out that I can press Esc to dismiss the dropdown, then tab away.

Steps to reproduce problem

1. Go to https://doc.wikimedia.org/oojs-ui/master/demos/?page=widgets&theme=wikimediaui&direction=ltr&platform=desktop#MenuTagMultiselectWidget-initially-selected-preset-options
2. Try to tab past one of the MenuTagMultiselectWidget inputs without adding or removing a tag

Environment

Browser: Firefox 68 and Chromium 83

Screenshots (if applicable):