Changeset 33925 for trunk/tests/phpunit/tests/comment/metaCache.php

In wp_list_comments(), update the comment meta cache when the comments derive from WP_Query and the new ->comment_meta_cached prop is false.

There are no uses of wp_list_comments() in Core where $comments are passed as the 2nd argument.

Adds unit tests.

Props wonderboymusic, bradt.
Fixes #16894.