Prevent jQuery UI dialog from blocking TinyMCE focusin

Including a TinyMCE textarea inside a jQuery UI dialog I found that I could not click or bring focus to the field in order to type in it.

A quick JavaScript solution directly from TinyMCE:

<script>
    // Prevent jQuery UI dialog from blocking focusin
    $(document).on('focusin', function(e) {
        if ($(event.target).closest(".mce-window").length) {
            e.stopImmediatePropagation();
        }
    });
</script>