2949 (When 'the_content' filter applied and bbpress shortcode added to Admin Editor of Wordpress post, bbPress un-registers (or prevents WP from registering) the dashicons, and the editor.min.css stylesheet) – bbPress Trac
How To Filter WordPress Content | NapitWPTech
WordPress the_content() - Stack Overflow
Adding a fixed text or element to all posts. The "the_content" filter — What about WordPress
Adding a fixed text or element to all posts. The "the_content" filter — What about WordPress