- Change the newly added `press_this_save_post_content` filter to `press_this_save_post` and pass the $post_data array to it.
- Remove the newly added `press_this_useful_html_elements`. It only runs in compatibility mode when a URL is typed by the user.
- Remove the `press_this_suggested_content` filter. It is redundant as the suggested HTML for the editor is already filtered by `press_this_suggested_html`.
- Add some more inline docs and rename couple of vars to make the code more readable.
Fixes#34455.
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