* Tokenize newlines in `WP_Embed::autoembed()` before running `->autoembed_callback()`
* Tokenize newlines with placeholders in `wpautop()`
* Introduce `wp_html_split()` to DRY the RegEx from `wp_replace_in_html_tags()` and `do_shortcodes_in_html_tags()`
Adds unit tests.
Props miqrogroove, kitchin, azaozz.
Fixes#33106.
git-svn-id: https://develop.svn.wordpress.org/trunk@33469 602fd350-edb4-49c9-b593-d223f7449a82