What problem does this feature solve?

Template languages like Jinja are languages in languages and they would benefit from highlighting twice: Once for the templated syntax, and once for the template language itself. Requirement for this to work would be the presence of multiple file extensions like nginx.conf.j2.

What feature do you propose?

• nginx.conf - First pass, strip the .j2 suffix, highlight as nginx
• nginx.conf.j2 - Second pass, highlight as Jinja, retain nginx highlighting