In the new API version, the webkit_user_content_manager_register_script_message_handler() world_name parameter should be nullable, but it's broken because I messed up the annotations. Reported at: https://discourse.gnome.org/t/registering-message-handler-in-default-world-in-webkit-6-0/14595/2
Pull request: https://github.com/WebKit/WebKit/pull/11802
Committed 261956@main (48a7c504b397): <https://commits.webkit.org/261956@main> Reviewed commits have been landed. Closing PR #11802 and removing active labels.