it's catching missing filters on how-to.tt, which is not part of Koha.
Created attachment 151268 [details] [review] Bug 33743: Make xt/find-missing-filters.t check directories in git index only
Created attachment 151269 [details] [review] Bug 33743: Make xt/find-missing-filters.t and xt/single_quotes.t check directories in git index only
Patches pushed for 23.05
Nice work everyone! Pushed to 22.11.x for next release