Addresses some edge cases parsing of script tag contents: - "<!-->" remains in the unescaped state and does not enter the escaped state. - Contents in the escaped state that end with "<script" do not enter double-escaped state. - "\f" (Form Feed) was missing as a tag name terminating character. Developed in https://github.com/WordPress/wordpress-develop/pull/9397 and https://github.com/WordPress/wordpress-develop/pull/9402. Props jonsurrell, dmsnell. See #63738. Built from https://develop.svn.wordpress.org/trunk@60649 git-svn-id: http://core.svn.wordpress.org/trunk@59985 1a063a9b-81f0-0310-95a4-ce76da25c4cd